What is a inregular verb?

There is a spelling mistake in your question. I believe you may be referring to an "irregular verb." Irregular verbs are verbs that do not follow the typical rules in verb conjugation, so their past tense and past participle forms are unique and not formed by adding "-ed" or "-d" to the base form. For example, "go" (base form) becomes "went" (past tense) and "gone" (past participle) in English.