Node
A node is a fundamental point of connection or intersection in a network, structure, or system, such as a junction in a graph or a device in a computer network. In modern applications, it underpins everything from biological systems like lymph nodes in the human body to digital infrastructures, highlighting its role as a vital link that enables flow and interaction without which the whole system could collapse.
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In graph theory, the idea of a node helped Leonhard Euler crack the Seven Bridges of Königsberg puzzle in 1736, birthing the field of topology and influencing modern GPS routing algorithms that billions use daily to navigate cities. This single concept has shaped not just math but also the backbone of social networks like Facebook, which connect over 2.9 billion users through virtual nodes.
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