We propose a method to study lattice QCD at finite temperature (T) and chemical potential (mu). We test the method and compare it with the Glasgow method using n(f) = 4 staggered QCD with imaginary mu. The critical endpoint (E) of QCD on the Re(mu) - T plane is located. We use n(f) = 2 + 1 dynamical staggered quarks with semi-realistic masses on L-t = 4 lattices. Our results are based on O(10(3) - 10(4)) configurations.
