Mac storage basics · Apps and macOS itself
Can I delete built-in Apple apps like GarageBand, iMovie or Pages?
Short answer: GarageBand, iMovie, Pages, Numbers and Keynote can be deleted and re-downloaded free. Core macOS apps like Safari, Mail and Photos are part of the sealed system and can't.
Apps Apple installs from the App Store — GarageBand, iMovie, Pages, Numbers and Keynote — can be deleted like any other app, and re-downloaded free from the App Store later. GarageBand's extra sound content is a separate download you can also remove.
Apps that are part of macOS itself (Safari, Mail, Photos, Music and similar) live on the sealed system volume and can't be deleted. They also don't count against the space you can free.