* Most Frequently Appearing: If we're talking about the monster that appears in the most films, it's likely zombies. They've been a staple of horror films for decades, and their popularity continues to this day.
* Most Recognized: In terms of cultural recognition, the vampire might be a strong contender. Their image is instantly recognizable, and they've been featured in countless films, books, and other media.
* Most Widely Used: The monster itself is a broad category, often used as a catch-all term for creatures that are generally considered dangerous or frightening. This would encompass a vast array of creatures, from classic monsters like Frankenstein's monster and Dracula to more modern creations.
Ultimately, the answer depends on your specific definition of "common". But it's safe to say that zombies, vampires, and other classic monsters are all highly recognizable and have played a significant role in film history.