Personally means something that involves you directly, affects you as an individual, or reflects your own views and feelings rather than someone else's.

When your teacher says, “I personally think this book is wonderful,” she's making clear these are her own thoughts, not just repeating what others say. When something affects you personally, it touches your own life in a direct way. If a new school rule means you can't bring your favorite snack anymore, that rule affects you personally.

The word often signals that you're speaking from your own experience rather than general knowledge. You might say, “I don't know much about chess personally,” to mean you yourself haven't played it much, even if you know about it from watching others. Or you might explain, “I personally prefer science to history,” making clear this is your individual preference, and you understand others might feel differently.

Sometimes personally emphasizes that something involves you rather than being handled through someone else. If you deliver a message personally instead of texting it, you show up yourself to say it face to face. When a celebrity thanks supporters personally rather than through an assistant, they're making a direct, individual connection.

The word helps distinguish between your own experience and what you've heard about or what's generally true.