What is the difference between an anti-tank and a anti-personnel landmine?

Anti-tank landmine is most effective against land vehicles, while anti-personnel landmines are most effective against infantry. It will most of the time depend on the explosive charge in the mine. An anti-tank landmine will have more explosive to be able to pierce through a vehicle's armor, and the blast will often be concentrated, while anti-personnel landmines will send lots of shrapnel flying, which can easily incapacitate infantry.