Dendrites are the branching, tree-like parts of nerve cells that receive messages from other cells. Think of a nerve cell (also called a neuron) as having a main body with two types of extensions: one long cable that sends signals out, and many shorter branches that gather signals in. Those gathering branches are the dendrites.

When you see them under a microscope, they look like the bare branches of a winter tree, spreading out in all directions from the cell body. A single nerve cell might have dozens or even hundreds of these tiny branches, each one acting like an antenna picking up chemical signals from neighboring cells.

When you learn something new, your brain can grow new dendrites and strengthen existing ones, creating better connections between neurons. The more you practice a skill, whether it's reading, playing the piano, or solving math problems, the more elaborate your dendrites can become. This is part of why practice matters: you're helping your brain build its ability to communicate with itself.

Scientists also use the word dendrite to describe tree-like crystal patterns that form in rocks, on windows during winter, or in certain chemical reactions. These branching structures appear throughout nature because branching is an efficient way to spread out and make connections.