ZSH is a unix shell and a powerful command line interpreter, ZSH is much easier to use and setup, ZSH also allows you to program the command-line completion that helps you customize you shell and offers options and arguments for most used commands, with out-of-the-box support for several hundred commands.
You can install ZSH using Pacman.
sudo pacman -S zsh
grml-zsh-config, zsh distribution is a like
sudo pacman -S grml-zsh-config
If you prefer oh-my-zsh you can install that too
curl -L http://install.ohmyz.sh | sh
Now we have ZSH installed. If you have any problem, feel free to leave a comment below.