What is the difference between a pancake and a crepe?

i attempted pancakes today and surprisingly they came out well judging by how my husband was scoffing them. they were quite big in size and it just made me think whats the difference between that and crepes? or am i just getting it wrong. by the way i purchased the mix so all i had to add was eggs and water and whisk however me being me i added a pinch of Vanilla Essence and sugar. thanks