Explain False Sharing in highly concurrent Go applications.

False sharing occurs when independent variables fall onto the same CPU cache line, causing severe performance degradation.

CPUs fetch memory in chunks called cache lines (typically 64 bytes). If two goroutines rapidly update two separate variables that sit next to each other in a struct, the CPU treats them as the same cache line. It constantly invalidates and re-fetches the cache line across cores, ruining multicore scaling. Fix this using cache line padding.