Participle is a special form of a verb. There are two types of Participles: Present Participle and Past Participle.
Present Participle is formed by adding ending -ing to the main verb:
Past Participle of regular verbs can be formed by adding ending -ed to the main verb. Past Participle of irregular verbs (sometimes called Verb 3 form) need to be memorized as they do not have a common rule.
Present and Past Participles can be used as adjectives:
When participles come after a noun, they are used like reduced relative clauses: