When you are just starting your website, you may not get a whole lot of international traffic. As your audience grows, that will change quickly though. In certain cases, you may want to serve custom content to your visitors based on their location. GeoIP Detection is a plugin that helps you accomplish that. It detects geographic information based on IP that you can use in your themes and plugins.
The plugin comes with five functions to detect info from IP. You can use Maxmind GeoIP2 Lite, Precision and other data sources. Thanks to Geo IP Detection, you can change currency for your store based on country, show/hide specific content, or automatically change timezone.