Glucose test.?

Queen 💕 • 26•#1 due April '21💙👣

So this is my first pregnancy and ive always seen people talking about the glucose test, and since i just found out i figured it would be the best time to ask...

What is it? Its testing your sugars... i believe?

Why does everyone hate it? When will i have to take it? How many will i have to take?