Why would other software developers use other languages?

Some languages are easier to use and understand for programmers (high-level languages) but offer less control over computers. Others are more machine-friendly (low-level languages), making them faster to execute and more memory-efficient, but harder for humans to understand.

Do programmers use multiple languages?

Most developers define themselves as a Java, C++, Delphi, C#, Visual Basic, PHP, Ruby or Python developer. Some web developers will say they use JavaScript. In fact, most developers use several programming languages.