Hi Gourav_sharma,
We can access the Office 365 API by Office 365 client library and Office 365 REST API. It may be different with the different type of applicaiton you are developing.
You can find the sample project from link below:
Office 365 API code samples and videos
>>want to access the office 365 calendar api to get and access the Events of calendars amd subject of the calendars<<
We can use the Outlook calendar REST API to manipulate the appointment. You can get more detail from link below:
Outlook Calendar REST API reference
In addtion, here is an helpful link for getting strated Office 365 developing:
Get started with Office 365 APIs in apps
Regards & Fei
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