Page protections are operating-system memory settings that define what a memory page can do: be read, written, or executed. On Windows, these permissions are applied per page, so a process can change a region from writable to executable only when needed. Common protection modes include read-only, read-write, and execute-enabled combinations.
They matter in security because many attacks depend on changing memory permissions to run injected code or unpack hidden payloads. A typical suspicious pattern is a writable region becoming executable, especially if it happens in a process that was not expected to generate code at runtime. Defenders watch for protection changes, unusual executable memory in data areas, and chains that combine input handling with later execution. Protective controls such as DEP and EDR heuristics use these signals to detect abuse, but attackers may try to reach the same result through less obvious API sequences.