It’s a habit. The rule for using "a" or "an" is based on pronunciation, and not spelling. Since the word habit starts with a sounded "h", it takes the indefinite article "a".
It’s a habit. The rule for using "a" or "an" is based on pronunciation, and not spelling. Since the word habit starts with a sounded "h", it takes the indefinite article "a".
A habit is a routine that tends to occur subconsciously.
An habit is a routine that tends to occur subconsciously.
More examples:
She has a habit of losing her temper.
Barbara has been drinking so much that I’m worried that she is developing a habit.
A partial list of words that also begin with a sounded "h", and consequently take "a":
