What Is Pascal?

Pascal is a general-purpose, procedural programming language created to make correct, readable programs easier to write than to write incorrectly. It enforces strict typing, requires variables to be declared before use, and organizes code into clearly labeled blocks bounded by begin and end keywords instead of relying on indentation alone. Because the compiler checks types and structure rigorously, many mistakes that would silently compile in looser languages are caught before the program ever runs, which is why Pascal became a favorite first language in computer science education.

Pascal was designed in 1970 by Niklaus Wirth, a professor at ETH Zurich, as a language for teaching structured programming and as a practical tool for reliable software. It descends from ALGOL 60 but simplifies and tightens that language's grammar while adding stronger data types such as enumerations, subranges, and records. Wirth's central goal was to make it hard to write a program whose structure didn't match its intent, so the language favors explicit block structure, named constants, and compile-time checks over the terser, more permissive style of contemporaries like C.

While Pascal is no longer a dominant industry language, it remains alive in several concrete places: Free Pascal and its Lazarus IDE are used to build cross-platform desktop applications, Embarcadero's Delphi (a modern Object Pascal dialect) is still used commercially for Windows business software, and Pascal remains a staple in introductory computer science courses because its strict rules teach good habits early. Historically notable software such as early versions of Skype and Total Commander were built in Object Pascal derivatives, showing the language's practical staying power beyond the classroom.

Compared with C, which was designed around the same era for systems programming, Pascal trades some flexibility for safety: it uses begin/end blocks instead of curly braces, requires explicit type declarations with no implicit conversions between incompatible types, and separates a program's declaration section from its executable statements. C lets you treat memory and types quite loosely, which is powerful for systems work but easy to misuse; Pascal's compiler is deliberately stricter, rejecting many operations that C would silently allow, which is part of why it was long considered a safer teaching language.