What is the difference between SingleEmailMessage and MassMailMessage

The SingleEmailMessage can send message related to only single record.
MassEmailMessage can send mails related to multiple records (WhatId and TargetObjectId).
setTargetObjectId - The ID of the contact, lead, or user to which the email will be sent.
setTargetObjectIds - A list of IDs of the contacts, leads, or users to which the email will be sent.
Used for single record
Used for multiple records

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