The second in a trio of “big songs” - long, relatively complex songs that sound like they were the product of putting together separate pieces into one. Like Jesus of Suburbia, Paranoid Android was also made exactly that way.
Released as the opening single from the classic 1997 record OK Computer, the song you hear today was made up of parts of a number of separate work-in-progress songs, melded into one and cut down to about six minutes.