Adobe Target Legacy Implementation Javascript methods

[SkyGazer]

Hi All,

What to understand the use of adobe.target.getOffers(), adobe.target.applyOffers(), adobe.target.trackEvent() and adobe.target.triggerView().

What is the difference between these calls. I gone through the documents provided by adobe but didnt how to use it based on our requirement. 

Can someone give some usecase/scenarios where we can apply those calls ?

Thanks in Advance

Cheers