What is the meaning of -요?

A particle attached to intimate-style verbs and adjective endings and some blunt-style endings to form the polite style, the usual speech level for polite but not extremely formal conversation, e.g. by a student to a teacher, a child to a parent, or between colleagues.

A particle attached to substantives, adverbs, or non-sentence-final endings to show respect to the listener in the polite style.

Abbreviation of 이오 (io) (semi-formal speech level form of 이다 (ida, “to be”))

A suffix used only after a copula, enumerating objects or facts

Gyeongsang and Jeolla dialect form of -오 (-o, post-vowel allomorph of -소 (-so, semi-formal style sentence-final suffix))

Source: wiktionary.org