how do i download the web browser safari for imac

It's part of macOS. It should already be there.

You don't need to. It's there by default in imac.

Hey there! To find Safari, you can click on Spotlight Search, (The magnifying glass on the top right), (Or, on the keyboard, press Command + Space), Type “Safari” in the search and typically it would be the first result under “Applications”, so you can just type Safari and hit “Return”on the keyboard.

Or:

If Siri is enabled, just say “Hey Siri, open Safari”! (Although she likes to talk back, (to me at least))!

Quickly open apps on your Mac:

https://support.apple.com/guide/macbook-air/quickly-open-apps-apd6146dc002/mac

User Spotlight on your Mac:

https://support.apple.com/en-us/HT204014

Get to know Finder on your Mac:

https://support.apple.com/en-us/HT201732

Use Siri on your Mac:

https://support.apple.com/en-us/HT206993

The Help menu is especially helpful and unique to every application on your Mac, hope that helps!:

https://support.apple.com/guide/mac-help/get-help-on-your-mac-hlpvw003/mac

Are you asking about Safari 14? What version of Safari are you running? The version 14 would be offered from Apple as a software update