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The syntax that lets code share functions, components, data, and types between files.
export makes something available from one file; import uses it in another. Most modern JavaScript and TypeScript apps are built from many small modules connected this way. Import errors usually mean the path, name, file type, or package export is wrong.
Plainly
Think of Import / Export as a named building block in a big LEGO app. The syntax that lets code share functions, components, data, and types between files.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.