Ranked in these QuestionsQuestion Ranking
Apache has a lot of features and functionality.
Pro Free and open source
Pro Excellent OS support
Pro Easy solutions for complex configurations
Due to it's maturity, Apache has a lot of features to cover a wide range of situations.
Pro Great documentation
Apache has thorough documentation.
Con Arcane configuration format
Configuration is as good as the manuals go. As soon as you have to configure it by yourself, it becomes a lot more difficult due to a rather obtuse system of configuration with long and confusing variable names, which has become infamous among web developers.
Con Process Based Request Handling
Each request opens a new process/fork to handle just that request (ver memory inefficient)
Con Extremely inneficient
Opens a new thread for each request. In practice this means that unless you use a proxy (nginx) you can only have a certain number of people on your site at a time, and is extremely inefficient on the server side.