C++23 and C++26 bring features enhancing performance and productivity in high-performance services, such as real-time analytics and game servers.Concepts in C++ define requirements for template parameters, improving error handling and compiler optimizations.C++23 refines concepts with better library integration, making codebases more robust and enabling precise type constraints.Coroutines in C++20 simplify asynchronous programming and are lightweight constructs useful for handling concurrency in high-performance systems.Coroutines utilize keywords like co_await and enable event-driven models for efficient scaling.C++23 enhances library support for coroutines, making them more practical for real-world applications.The std::ranges library in C++20 and C++23 offers modern sequence manipulation, aiding lazy evaluation for better performance.Modules in C++23 improve compilation efficiency by replacing headers, leading to faster builds.C++23 expands constexpr and introduces tools for leveraging multi-core CPUs in performance-critical applications.Expected features in C++26 include static reflection and pattern matching for code optimization and readability.