someone who develops real estate (especially someone who prepares a site for residential or commercial use)
"The local developer cleared the forested lot to make way for the new shopping center."
photographic equipment consisting of a chemical solution for developing film
"After shooting the roll, I rushed home to use my darkroom developer on the exposed negatives before they faded in the light."
A person or entity engaged in the creation or improvement of certain classes of products.
"The software developer spent all night fixing a critical bug before the new version could be released to users."
In plain English: A developer is someone who creates new buildings, software, or products by planning and building them from scratch.
"The app developer released an update to fix the login bug."
Usage: In everyday usage, a developer is the individual or company responsible for creating new software applications or improving existing ones. You might refer to a mobile app creator as a developer when discussing who built the program you are using.
The word developer comes from the verb develop with the suffix -er added to it. It originally referred to a person or thing that causes something to grow or unfold.