like a star system. Systems can also be concepts made by people to organize ideas. A subsystem is a system that is part of some larger system. For example...

The Solar System is a group of space objects that are held together by gravity, with the Sun in the center. The Sun is a huge ball of hot glowing gas that...

An operating system (OS) is a kind of computer program that helps a computer to interact with other machines or with people. An OS is not actually one...

A Planetary system is the general term for a star with planets and other objects in orbit around it. The Solar System is one of these. It is now clear...

endocrine system is a system of glands, each of which secretes a type of hormone directly into the bloodstream to regulate the body. The endocrine system is...

The digestive system is a part of the body that digests food. It is called the gastrointestinal system. It breaks down food into simple chemicals which...

A numeral system (also called a number system or system of numeration) is a way to write numbers. Roman numerals and tally marks are examples. "11" usually...

The circulatory system (also called the cardiovascular system) is the body system that moves blood around the body. It consists of the heart and blood...

metric system is a number of different systems of measurement with length based on the metre, mass on the gram, and volume on the litre. This system is used...

reproductive system is the part of an organism that makes them able to sexually reproduce. human and other animals use their reproductive systems to have sexual...

A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by...

The Family Computer Disk System, Famicom Disk System, FCD, FCDS or FDS is a disk drive add-on for the Family Computer video game console that was released...

A writing system (also called a script) is a system of symbols used to represent language. There are different kinds of writing systems, with symbols...

An embedded system is a computer that has been built to solve only a few very specific problems and is not easily changed. The word embedded means it is...

A small Solar System body (SSSB) is a term defined in 2006 by the International Astronomical Union to describe solar system objects which are not planets...

biochemical process, see respiration The respiratory system, also called the gas exchange system, is the body getting rid of carbon dioxide and taking...

The International System of Units is the standard modern form of the metric system. The name of this system can be shortened or abbreviated to SI, from...

Hindu–Arabic numeral system, sometimes known as the Indo–Arabic numeral or Latin numeral system or simply the Hindu numeral system, Indo numeral system or Arabic...

nervous system is a body system which sends signals around the body. It lets animals respond to what is around them. The central nervous system is the...

The Sega Master System (SMS) is a home video game console made in 1985. It was not very popular in North America and Japan but was very popular in Brazil...

In mathematics and geometry, the Cartesian coordinate system is a coordinate system used to give the location of points on a plane by using two numbers...

The formation and evolution of the Solar System describes how the Solar System began, and how it changed. About 4.6 billion years ago, there was a large...

nervous system (ANS) controls the conditions inside the body. It is sometimes called the 'visceral nervous system' or 'involuntary nervous system'. The...

immune system. This older system is non-specific, whereas the adaptive system is tailored to specific targets. Whereas the innate immune system is found...

The male reproductive system is made up of a number of sex organs. It works in the process of human reproduction. Some organs are outside the body, some...

In biology, an organ system is a group of organs that work together to perform one or more functions. Each does a particular job in the body, and is made...

The voting system is a set of rules about the way people vote and how the votes are counted. Different countries have different voting systems. There are...

Data System (commonly known as BOLD or BOLDSystems) is a web platform specifically devoted to DNA barcoding. It is a database and analysis system developed...

The Nintendo Vs. System is a series of arcade ports of Nintendo Entertainment System home video games made by Nintendo. It was released in the late 1980s...

System of a Down is an American metal band. It was formed in 1994 in Los Angeles, California with four members of Armenian descent: Serj Tankian (lead...

Android is an operating system used in mobile devices. It is mostly used for smartphones, like Google's own Google Pixel, as well as by other phone manufacturers...

parliamentary system of government means that the executive branch of government has the direct or indirect support of the parliament. Parliamentary systems often...

human musculoskeletal system (also known as the human locomotor system, and previously the activity system) is an organ system that gives humans the ability...

The immune system is the set of tissues which work together to resist infections. The immune mechanisms help an organism identify a pathogen, and neutralize...

A system-on-chip (short-form SoC) is a kind of electronic integrated circuit (IC or computer chip). What is special about system-on-chips is that they...

complex system is something made of many parts. These parts are called elements or agents. They work together in ways that make the whole system act differently...

The urinary system (the urinary tract) is a system of organs that makes urine/pee and takes it out of the body. Urine is watery waste of the body. Our...

The sensory system is the way animals find out about their nearby environment and their bodies. To do this they have special devices for collecting data...

of Solar System objects by orbit, by distance from the sun. Most objects in this list have a diameter of 500 km or more. The inner Solar System contains...

lymphatic system is a network of thin vessels that branch, like blood vessels, into tissues throughout the body, in mammals. It is part of the immune system. It...

A coordinate system is a system of numbers used to uniquely determine the position of a point. For two-dimensional systems, the numbers (scalars) are...

Many countries have a film rating system to help parents determine which movies their children can watch. The systems usually use age to rate the movies...

The Motion Picture Association film rating system is a system used by the MPA. It is meant to help parents and movie-goers decide which movie is suitable...

A dialog system or conversational agent (CA) is a computer system intended to converse with a human, in coherent, structured language. Various so-called...

system (CNS) is the largest part of the nervous system. It is made up of the brain and the spinal cord. Together with the peripheral nervous system,...

physical systems. Everything outside the system is called the environment, which in the analysis is ignored except for its effects on the system. All matter...

The Integrated Taxonomic Information System (ITIS) is an American organization. It works with several federal agencies to unify the information gathered...

are many systems of measurement. Some systems of measurement describe physical systems. Other systems of measurement describe economic systems. The term...

The Dewey Decimal System is a way to put books in order by subject. It is often used in public libraries and schools in the United States and other countries...

The X Window System is software for a graphical user interface (GUI) system. It is a set of protocols and programs. It is also known as X11, or just X...