Statistics can help provide concrete examples of a larger trend, give the basis for an important chart or graph, or make theoretical arguments tangible.
There are two main branches of statistics:
Be aware of bias in statistics! Numbers can be manipulated, and charts and graphs can be arranged to give a certain impression. Always double-check your facts!
If you're not sure what kind of statistic you need, or what subject area your research falls under, or if you just need some general statistics, try one of these fantastic resources.
Remember that Data is different from Statistics. Data is the raw information and statistics are created using data, thus statistics provides the interpretation of data. Keep this in mind as you look through the resources so that you can use the materials accurately.