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IT totally depends upon the requirement (user story)we will be using.May I suggest you please refer the below link for reference on Ajax.
- apex:actionFunction
- apex:actionPoller
- apex:actionRegion
- apex:actionStatus
- apex:actionSupport
- https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_actionFunction.htm
- http://www.jitendrazaa.com/blog/webtech/salesforce-tutorial-create-simple-ajax-based-visualforce-page/
Hope it will be helpful.Please mark it as best answer if the information is informative.
Thanks
Rahul Kumar