What exactly is neoliberal economics?

I’ve been trying to figure out what neoliberal economics really is, but I can’t seem to find a clear answer anywhere. Is it related to the Austrian school? Because I see Hayek often mentioned as one of its founders. Is it part of the Chicago school, because of Milton Friedman? Or is it more like crony/mixed economics, where big businesses and governments partner? Is it really just laissez-faire? What the heck is neoliberal economics?