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JavaScript with types, so code can catch shape mistakes before it runs.
TypeScript lets you say what a value should look like: a user has an id, a lexique entry has a term, a function returns a string. It does not replace tests, but it catches many common mistakes while you are editing and during build.
Plainly
Think of TypeScript as a named building block in a big LEGO app. JavaScript with types, so code can catch shape mistakes before it runs.
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.