The document compares three methods for importing data into Salesforce: the Salesforce Data Import Wizard, DataLoader, and DataLoader.io. The Salesforce Import Wizard is built into Salesforce and is best for small, simple imports. DataLoader needs to be downloaded but can import data for one object at a time and access more objects. DataLoader.io is a cloud-based option that offers a free basic version and supports importing and exporting data.