A lot of people or things in a large group make up a crowd. The masses of performers with painted faces, big shoes, and squeaky noses filling up the streets during your town's annual clown parade can be described as a crowd of clowns.
A crowd of people might gather for a party, concert, or demonstration, with the word crowd implying that there's something a little disorderly — noisy or unruly — about the group. Crowd can also mean "the mass of ordinary people," which is the way you're using the word when you say you want to "stand out from the crowd." You want to be seen as a distinct, individual person, rather than part of a larger mass of regular folks.