Deploying application or application changes to sandbox or Production in salesforce

We can move salesforce application or changes from sandbox to other sandbox  or production  in two ways.
1.Change sets.

    #  Change sets(outbound Change Sets, Inbound Change Sets) are available in sandbox  .                   

    #  Outbound change sets helps to move change sets to another sandbox.

         Inbound  change sets helps to receive changes to sandbox or production.

    #   Deployment Connections are required to move change sets. Deployment connection is created between all organizations affiliated with a production organization .

  #  Deployment connections can't be created between arbitrary organizations.

Note:-Single Change set can move 5000 components only.

2.Eclipse 

    #  we can also deploy application using force.com plug in eclipse.

    #  Eclipse is only solution To move application to other environments than sandbox  and  Production .

    #  we cannot move single field and approval Process using eclipse,in this scenario only choice is change sets.