Creating a wrapper class in C++ involves encapsulating functionality and data of existing classes or primitives to provide a simplified interface. In the context of a templated singly linked list, a wrapper class can manage the list's operations while abstracting the underlying implementation details. C++ templates serve the purpose of enabling generic programming, allowing developers to write code that works with any data type. This flexibility promotes code reusability and type safety. Templates are instantiated at compile-time, meaning that the compiler generates the appropriate code for each specific type used, which enhances performance.The lifecycle of a C++ template begins with its definition, where the template parameters are specified. When a template is instantiated with a specific type, the compiler generates a concrete class or function. This instantiation process occurs during compilation, leading to type-specific implementations. The resulting code is then used in the program, and upon program termination, the resources are released, completing the lifecycle.