iTerm2 is a replacement for Terminal and the successor to iTerm. It works on Macs with macOS 10.10 or newer. iTerm2 brings the terminal into the modern age with features you never knew you always wanted. It's by far the most powerful and flexible terminal app you can use on a macOS computer.
To make it more beautiful with a nice and polish UI, I use the Nord color palette with Powerlevel9k and the Hack font in size 12pt. Alternatively, you can use this Material Design color palette, the Dracula theme or the famous Solarized color palette and the Source Code Pro font by Adobe.