To revolutionize something means to change it so completely and dramatically that it works in an entirely new way. When the printing press revolutionized how people shared information, books went from rare treasures that took months to copy by hand to products that could be made by the thousands. When the internet revolutionized communication, people went from waiting days for letters to sending messages instantly across the world.

When something revolutionizes a field, it's like the wheel has turned so far that you're facing an entirely different direction.

Revolutionize is stronger than just “improve” or “change.” A faster horse and buggy improves transportation, but the automobile revolutionized it. A sharper pencil improves writing, but the computer revolutionized how people write, edit, and share their work.

Scientists might revolutionize medicine with a breakthrough treatment. An inventor might revolutionize farming with new technology. A teacher might revolutionize how students learn a subject by discovering a completely new approach. When something gets revolutionized, people can look back and wonder how they ever did things the old way.