Logo is a programming language created in 1967 by Wally Feurzeig, Seymour Papert, and Cynthia Solomon. It was designed as a teaching language, and Logo programs are created by typing instructions in a language called Logo turtle graphics.
Logo is an interpreted language, meaning that programs execute one line at a time. This makes it well-suited for interactive applications and for teaching programming concepts.
Logo has a number of features that make it unique among programming languages. One is its focus on turtle graphics, which allows programmers to create images and animations by controlling a "turtle" on the screen.
Another is its use of recursion, which allows a Logo program to call itself to repeat a task. This can be used to create complex shapes and patterns.
Logo is also known for its "catch" and "throw" commands, which allow errors to be handled in a controlled way. This makes Logo programs more robust and easier to debug.
Despite its unique features, Logo has been largely overshadowed by other programming languages in the past few decades. However, it remains popular in education, and there are a number of implementations of Logo available, including FMSLogo, UCBLogo, and LOGO-L.