Redshift is an open-source screen color temperature adjustment tool that automatically adjusts the screen temperature based on time to reduce eye strain. It supports manual latitude and temperature settings, ensuring smooth transitions to protect eyes. Installation on Ubuntu is simple with the command "sudo apt-get install redshift." It can be run via command line or a configuration file, allowing users to set specific day and night temperatures using Kelvin. Redshift's parameters like temperature settings, transition smoothness, and location provider method can be easily configured in the redshift.conf file for automatic screen temperature adjustments.