Plank is a minimalist dock designed for Linux desktop environments, known for its simplicity and performance.Key features of Plank include being ultra lightweight, having a minimal UI, extensibility, and theming support.To install Plank on Debian or Ubuntu, use command lines: sudo add-apt-repository ppa:ricotz/docky, sudo apt-get update, sudo apt-get install plank.Plank allows customization with themes, which can be downloaded and applied easily through Plank settings.