C++Builder is an integrated development environment (IDE) designed for building applications using the C++ programming language. It provides a visual interface that allows developers to create user interfaces quickly by dragging and dropping components onto a form. This makes it easier to design applications without extensive coding for the graphical elements. In addition to its visual design capabilities, C++Builder includes a powerful compiler and libraries that support various application types, including desktop and mobile apps. It is part of the Embarcadero RAD Studio suite, which also supports other programming languages like Delphi, enhancing productivity for developers.