HTTP Status Code 412 signifies Precondition Failed. This status is returned when a client makes a request that includes certain conditions in the If-Match, If-None-Match, If-Modified-Since, or If-Unmodified-Since headers, but those conditions are not met by the server. Essentially, the server is informing the client that the request cannot proceed because the specified conditions regarding the resource's state are not satisfied. This often occurs in scenarios involving cached responses or when a resource has changed since the client last accessed it.