Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
There are (as of now) 18 questions tagged as search-engine
21 questions tagged as search-engines
Here's requesting merging of the above 2 tags. Optionally, search-engines could be made as a synonym of search-engine
The merge is complete and search-engines has been remapped to search-engine