safari

If you deleted Safari and don't have a Time Machine backup or other backup, reinstall macOS to put Safari back in your Applications folder. Reinstalling macOS doesn't remove data from your computer. 

Before reinstalling, you might want to use Spotlight to search for Safari on your Mac. If you find it, but it's no longer in your Dock, just drag it to the Dock to add it back.

To clarify the problem, is the Safari app missing from the Applications folder? If it is there, then just drag it onto your dock and that will create an alias there.