What do you understand by event receivers in SharePoint?

Event Receivers are custom methods that are written to handle certain events within a list or document library. There are basically two types of event receivers, which are as follows:
  • Synchronous Events - these events are like "ItemAdding" or "Uploading"
  • Asynchronous Events - these events are like "ItemAdded" or "Uploaded" 
The Event Receivers are either derived from the base class "SPListEventReceiver" or "SPItemEventReceiver".

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