Hydrostatic pressure. just imagine a tube of water you're holding and you put a pin in it at the top, no big deal. Then put a pin in the bottom of the tube. Imagine the pressure of 4' of tube water pushing out that pin hole. The ground is like this on the ext. of your basement walls. five or six feet of heavy moist ground and water.
so Drylok is good as is hydraulic/water curing types of cement, but these are band aids.
The expensive fix is french drains around the house. Big project. If it is water table and the floor of the basement is not a slab I'd put a french drain in the actual basement ground running to a sump pump in the corner. I'd cover it with gravel, and maybe a vapor barrier and then pour a few inches of new slab. This will force away ground moisture to pump bucket and out of the house.
How wet is it? If it's just wall moisture, no puddles, I'd put in two dehumidifiers and a couple fans. I'd make sure there was no mold anywhere (different route) and then when it was dry enough, I'd use Drylok Extreme.