First Look at LURE! Bringing AUR to All Linux Distros
AUR (Arch User Repository) is a community-driven repository for Arch-based Linux distributions.
Long story short: it helps install packages not available in the official repositories and lets you get the latest releases.
I found it helpful with my experience on Manjaro Linux.
Technically, AUR builds a package from the source and then utilizes the package manager (pacman) to install it.