What's the difference between a 'fear' and a 'phobia'?

What's the difference between a 'fear' and a 'phobia'?

A fear is your natural biological reaction. Let's say that you were walking through the forest and a lion came at you, you're going to have this rush of adrenalin and you're going to be afraid. Whereas a phobia is something that develops over time and you might even be afraid of it when you're not even in the situation. So let's say that someone is afraid of heights they might be thinking about that fear of heights when they're not even up somewhere high. Also with a phobia the situation is not necessarily dangerous it might be something that you think is dangerous but isn't actually.