And you can write your source code in it but to compile something you don't run a command like GCC and then the name of the file, you instead click a button.

你们可以在上面写源代码,如果要编译的话，不用像GCC这样要输入命令，文件名,只需点击按钮就可以了。

哈佛公开课 - 计算机科学课程节选