Reflexive verbs in Spanish grammar are types of verbs which indicate that the subject of the sentence undergoes or experiences the action to itself. These verbs are usually accompanied by reflexive pronouns such as ‘me’ (myself), ‘te’ (yourself), ‘se’ (himself, herself, themselves, yourselves), ‘nos’ (ourselves), ‘os’ (yourselves). Understanding reflexive verbs is crucial in mastering Spanish as they are commonly used in daily conversations, expressing activities involving personal habits or actions that affect the speaker.