All art rose as a reaction or result of movements going before it. Impressionism was the same, as it was an experiment with color and light which went beyond the approaches to painting before it. Although it's been a while since I've studied 19th Century art, I do believe that Renoir was actually not technically part of the Impressionist group.
Renoir was a full member of impressionism but his paintings slowly differed from the first impressionist rules; he developed a more "commercial" work due to his poor economical background, child of a working class family. (by opposition to the one of Monet who was from a wealthy family) and started to apply a more disciplined, formal technique to portraits and figure paintings in an attempt to return to classicism.
About the impressionists, they were among the first to turn their back from the public and "mecènes" expectations to fully dedicate themselves to their art, starting the Modern Art era.