What does "http://*/*", "https://*/*" and "<all_urls>" mean in the context of Chrome extension's permissions

I am trying to understand the working of Google chrome extensions. I was studying the manifest.json file where I came across the permissions "http://*/*", "https://*/*" and "<all_urls>"

Can anybody explain what do these permissions mean?

Solution 1:

• "<all_urls>": matches any URL that starts with a permitted scheme (http:, https:, file:, or ftp:).
• "http://*/*": Matches any URL that uses the http: scheme.
• "https://*/*": Matches any URL that uses the https: scheme.
• "*://*/*": Matches any URL that uses the https: or http: scheme.

These permissions are required if your Chrome extension wants to interact with the code running on pages.

Match patterns documentation