Data Import: Choosing the Right Tool | Salesforce

Salesforce has several tools to help you import your data. This video offers a quick comparison on the different tools, and covers the Data Loader tool in depth. We'll walk through an actual import using the Data Loader, providing tips along the way.
links:
Data Import playlist
sforce.co/dataimport
Data Loader Overview
https://developer.salesforce.com/docs/atlas.en-us.dataLoader.meta/dataLoader/