Lifecycle management of execution context governs how a program's runtime environment is created, activated, suspended, and terminated. Creation allocates a stack, control block, and registers, establishing a unique context for each thread or process. Activation loads saved state into CPU registers, making the context runnable. Suspension—often triggered by blocking I/O, synchronization primitives, or explicit yields—stores the current register state and relinquishes the CPU, allowing other contexts to run. The scheduler selects the next runnable context, performing a context switch that saves the outgoing state and restores the incoming one, typically via kernel save/restore routines. Termination deallocates resources such as stack memory, control blocks, and any held locks, ensuring no leaks. In preemptive systems, timer interrupts force periodic switches, while cooperative systems rely on explicit yield calls. Proper handling of context lifecycles is essential for performance, correctness, and resource efficiency, especially in multithreaded environments where synchronization, priority inversion, and deadlock avoidance depend on accurate state management.