The basement of any home is prone to having a great deal of moisture. This is because a basement is underground and moisture will come up through the floor and sometimes through the walls. One solution is to have a dehumidifier down there, but that does not stop the water and moisture from coming in.
The Moisture Barrier
The first thing you should do for basement moisture is consider the main options. First, you could never use the basement at all and keep the door shut. Since that is not very practical, you will need to have a basement floor moisture barrier put in. This will keep moisture from seeping in and it will help keep the basement dry.
Since most of the basement moisture comes from the floor, the moisture barrier is ideal. While it will not stop any coming through the walls, it stops the majority.
If you are going to have any type of flooring put in the basement or you are planning to have it finished, you will first need to have a moisture barrier. Otherwise, water will still make its way up through the floor and this will dislodge any tile, ruin carpet, and absolutely destroy hardwood floors.
Mold is a big problem all over the world. It needs moisture and a temperature that is not freezing. A basement is thus the perfect breeding ground. If you have a mold problem in the basement, you will need to have a moisture barrier on the floor and will most likely have to seal the walls.
A dehumidifier is still a good idea in that case. If the problem is very bad, you may have to take more drastic steps and a mold expert will be needed for that. For the sake of prevention, go ahead and get the moisture barrier.