In the search of oneself, what is uniquely identity and what is identity?

“People do not have a ‘real’ identity within themselves; it is just a way of talking about self, prosthetic
it is a discourse. An ‘identity’ is communicated to others in your interactions with them, but this is not fixed things within a person. It is shifting, temporary construction.” Gauntlett, D. (1998) on Foucault’s ideas of identity.

When a person search for identity, what are the things one should look for and how to look for it.

What are the differences between uniqueness and identity?