title: What is the name of the capability in VS Code where you can hover over a variable and see where it's defined?
body: <p>When you hover over a variable in VS Code, e.g., a function name, there's a small pop up that shows where the function is defined and some other quick details. What is the name of this feature?</p>
  <p>I'm setting up VS Code on a new computer, and I'm trying to get that feature, but not sure what it's called.</p>