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Gadivemula KrishnaGadivemula Krishna 

I didnt understand singleemailmessage is a class or method. While Messaging is a class. What about singleemailmessage?

Best Answer chosen by Gadivemula Krishna
SwethaSwetha (Salesforce Developers) 
HI Krishna,
SingleEmailMessage class contains methods for sending emails.

SingleEmailMessage contains methods listed in 
https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_email_outbound_single.htm#apex_Messaging_SingleEmailMessage_methods

SingleEmailMessage Constructors:
https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_email_outbound_single.htm#apex_Messaging_SingleEmailMessage_constructors

If this information helps, please mark the answer as best. Thank you

All Answers

SwethaSwetha (Salesforce Developers) 
HI Krishna,
SingleEmailMessage class contains methods for sending emails.

SingleEmailMessage contains methods listed in 
https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_email_outbound_single.htm#apex_Messaging_SingleEmailMessage_methods

SingleEmailMessage Constructors:
https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_email_outbound_single.htm#apex_Messaging_SingleEmailMessage_constructors

If this information helps, please mark the answer as best. Thank you
This was selected as the best answer
Gadivemula KrishnaGadivemula Krishna
So when we used this line of code "   Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); " ,  are we calling innerclass? Because we are using Messaging.SingleEmailMessage