C++ comes with a feature-rich and powerful standard library. Many functions that required C developers to use third-party libraries are now part of the standard C++ library. This means less external dependencies, more stable and predictable behavior, and improved portability between hardware architectures.

The C++ standard library comes with containers built on top of the most commonly used data structures, such as arrays, binary trees, and hash tables. These containers are generic and efficiently cover most of the developer's everyday needs. Developers do not need to spend time and effort creating their own, often error-prone, implementations of the essential data structures.

The containers are carefully designed in a way that minimizes the need for explicit resources, allocation, or deallocation, leading to significantly lower chances of memory or other system resources leaking.

The standard library also provides many standard algorithms, such as find, sort, replace, binary search, operations with sets, and permutations. The algorithms can be applied to any containers that expose integrator interfaces. Combined with standard containers, they help developers focus on high-level abstractions and build them on top of well-tested functionality with a minimal amount of additional code.