Revolutionize, a verb, means "to make a major change," like in the 1990s, when the Internet revolutionized how people communicated, got information and even did their jobs. Things were never the same again.
Use revolutionize to describe something that is completely transformed. Originally, it meant "to bring about sweeping political change," like people who band together and fight to revolutionize a nation, with the end result being a new party in power or new philosophies about things like land ownership or tax collection put in place. In time, it also came to mean even nonpolitical change, like the digital music player, which revolutionized how people get and listen to music.