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!
Starting Points
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.