Programming languages are tools to allow humans to make a computer do what you want. In theory, any language can be used to create any program but realistically you want the appropriate tool for the job.
Do you want it store tons of data? Do you want it to run on the cheapest chip available? Does it have an user interface? Do you want a web page? Does it need to handle financial transactions? All these thingd affect you choices.
1. If you want the computer to do things quickly using little memory, use C.
2. If want to solve mathematical equations, use Matlab.
3. If you want to store and retrieve data, use SQL.
4. PHP and Javascript are used on web pages.
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