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Santoshi K VSantoshi K V 

Hello!! What's the use of 'this' keyword and when to use it ?

AnkaiahAnkaiah (Salesforce Developers) 
Hi Santhosi,

‘this’ is a reference variable that refers to the current object.

Refere the this article.
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_keywords_this.htm

If this helps, Please mark it as best answer.

Thanks!!