Reflexing pronouns name a receiver of an action identical to the doer of the action.
examples:

• She can do it herself.
• Let them speak for themselves.
• I was just talking to myself.
• He often asks himself why he does not return home.

Reflexive pronouns are often used to emphasize (frequently in the form of preposition+reflexive pronoun).
examples: The words that are underlined are prepositions.

• Let him speak for himself.
• Chris will tell her himself.
• She lives by herself.
• We will set the table ourselves.
• The cd player stops by itself.
• They do not like meat themselves.