A node is a point where things connect or meet, like a junction in a network. Think of it like the knots in a fishing net: each knot is a node where several threads come together.

In computer networks, nodes are the devices connected together. Your laptop, your phone, and your home's wireless router are all nodes in your home network. The internet itself is millions of nodes connected to each other, allowing information to travel from one place to another. When you visit a website, data jumps from node to node across the network until it reaches you.

In math and science, nodes appear in different contexts. On a vibrating guitar string, the nodes are the points that stay perfectly still while the rest of the string moves. In biology, lymph nodes are small organs throughout your body where your immune system filters out germs and other harmful substances.

Whether you're talking about computer networks, transportation systems, or even social networks of friendships, nodes are the critical connection points that hold everything together.