Apache is an open source web server that's supports php, Apache is known to be open source because the source code is available for configuration as per your requirements, its a Linux based product. on the other hand IIS is a Microsoft product you need a licence to use it commercially, there is no way of configuring any tabs in the code.
Apache is economical t use compared to IIS
By VALANCIO DANIEL FERNANDES
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The main difference between Apache and IIS is the cost. Apache is free, where IIS will cost you an annual fee. Also, another difference is the enhanced security that Apache provides.