What is the difference between a line of credit and a credit limit?

I just got approved for my first credit card. It's the Discover Student Card and they say that my line of credit is $1,000 but I don't know what my credit limit is yet. I was just wondering what or if there is a difference between a line of credit and a credit limit.|||Your line of credit and credit limit are the same thing.|||Your credit limit is $1000.