"Pascal was influenced by the ALGOL W efforts, with the explicit goals of teaching programming in a structured fashion and for the development of system software.[5] A generation of students used Pascal as an introductory language in undergraduate courses."
Its grammar made it relatively easy to write compilers for the language, which could be done as undergraduate exercises. Of course, this did not make it so popular with professional programmers - see http://eprg.org/computerphile/pascal.pdf by Brian Kernighan, although extended Pascals such as Delphi were very productive in the Windows environment.