This FAQ is for people brand new (or returning) to the Salesforce1 Platform and looking to create new integrations.
We have a broad family of products which each get branded (or at times re-branded) over the years. Salesforce1 refers to the entire family of those products. Force.com refers specificialy to tools on our SaaS cloud (i.e. Apex and Visualforce). Don’t let the branding confuse you, the important parts for integration are: