What is “zsh” Package?

UNIX shell (command interpreter)
For more details: https://www.zsh.org/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install zsh.

  brew install zsh

Now, use zsh!