RTTI, or Run-Time Type Information, is a feature in programming languages like C++ that allows a program to determine the type of an object at runtime. This is particularly useful in scenarios involving polymorphism, where a base class reference can point to derived class objects. RTTI helps in safely casting these objects and ensuring that the correct methods are called. RTTI typically includes mechanisms like dynamic_cast and typeid, which enable developers to check an object's type and perform safe type conversions. By using RTTI, programmers can write more flexible and maintainable code, as it provides insights into object types during program execution.