"Erm" is a common filler word used in English when someone is thinking, hesitating, or trying to gather their thoughts before speaking. It’s similar to "um" or "uh" and is often heard in casual conversations, interviews, and even public speaking. People use "erm" subconsciously to fill a gap while they process their next words. It can indicate uncertainty, a need for clarification, or simply a moment of hesitation. For example, if someone asks, "Do you know the capital of Australia?" and you reply, "Erm… Sydney?" (which, by the way, is incorrect it’s Canberra), the hesitation suggests you're unsure.