It's ripgrep https://github.com/BurntSushi/ripgrep

It's one of a number of greplike tools out there. Here's a comparison chart:

https://beyondgrep.com/feature-comparison/

If you're looking for other alternative shell tools, take a look at https://altbox.dev/

ripgrep. It's a bit faster and automatically ignores files in .gitignore etc. Very handy.