What is the meaning of Developer?

A person or entity engaged in the creation or improvement of certain classes of products.

A real estate developer; a person or company who prepares a parcel of land for sale, or creates structures on that land.

A film developer; a person who uses chemicals to create photographs from photograph negatives.

A liquid used in the chemical processing of traditional photos.

A reagent used to produce an ingrain color by its action upon some substance on the fiber.

A software developer; a person or company who creates or modifies computer software.

developer (real estate developer)

developer

developer

developer (software programmer)

Source: wiktionary.org