What is the Meaning & Definition of node

A node is a point or space in different disciplines where several other points converge in interrelation. It is called node in science and other disciplines to the real or abstract point where different parts of a connection meet to communicate among themselves.
For example, in technology, a node is the point, time or space where all the elements of a network that share the same characteristics are linked and interact. These elements are in turn nodes and can relate hierarchically or in a horizontal network or otherwise.
This type of cases is seen in computer science and, more specifically, on Internet networks. In this example each computer and each server is a node.
The same happens in electronics, where the nodes are the points of a circuit.
This same concept of what a node is used in sociology, to explain phenomena that occur by means of a binding agent. For example, between different types of organizations such as companies and educational institutions that have a node that will allow interactive communication. This applies both to natural phenomena as artificial, and in cases of negative interaction as positive.
On the other hand, in astronomy is called node to a point that in a certain orbit operates by cutting another set datum plane. Ascending node is called when the body goes from South to North and down when it is from North to South. For example, it is said that Aries is an ascending node of the ecliptic in the Ecuador.
The node is a standing wave whose amplitude is always zero for physics.
Finally, in programming it is called as node to any item in a list, tree or graph in data structures. Through a node it must be accessible to other nodes in the same structure. These elements are key to build dynamic and moving structures.