Rust is a systems programming language designed for performance, reliability, and concurrency, making it an excellent alternative to C++. Developed by Mozilla, Rust emphasizes safety and concurrency without sacrificing performance. It achieves memory safety through its ownership model, eliminating common issues like null pointer dereferencing and data races. Rust is particularly suited for developing large, complex systems where both speed and safety are paramount, such as in operating systems, game engines, and web assembly.