Art changed during the Renaissance in several ways. Most importantly, art was not only focused on religion. Artists started using new techniques and patterns to create their works of art. Art became less focused on technique and works of art became more unique.
Renaissance art changed in several ways during the Renaissance. For example, art of this period began looking back to antiquity for inspiration. You can learn more at http://www.ask.com/wiki/Renaissance_art.
In the Renaissance, art was more heavily funded by patrons, and it became very decadent, as well as based on concepts from math and physics. To learn more about the Renaissance, check out: http://wiki.ask.com/Renaissance.