So I don't understand tweet and I go to dictionary.com to find out what they're talking about and I get: noun 1. a weak chirping sound, as of a young or small

So I don't understand tweet and I go to dictionary.com to find out what they're talking about and I get: noun 1. a weak chirping sound, as of a young or small bird. verb (used without object) 2. to make such a sound. Leaves me with still no idea what they're talking about.