Build and built are two forms of the same verb. Build means to construct something by putting pieces or parts together. Build is the present tense of the verb and built is the past and the past participle of build. This is the main difference between build and built.

Have been built or have been build?

"Is being built," "has been built," "will be built," etc. are all passive forms. "Build" is active: (a subject) may build (an object).

What is the meaning of have built?

Built is the past tense and past participle of build. 2. adjective [adverb ADJECTIVE] If you say that someone is built in a particular way, you are describing the kind of body they have.