I appear to welcome you, vanish if ignored, and cannot be held. What am I?

Category: Brain · Difficulty: easy

Hint: Think about an opening that suggests entry.

Answer

A door left ajar

Explanation

A door left ajar invites entry but disappears as a signal when closed.

This is an easy brain riddle — a good one for children and beginners. The answer is A door left ajar.

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