What is Kiss of peace?

The kiss of peace is an ancient traditional Christian greeting, sometimes also called the "holy kiss", "brother kiss" , or "sister kiss". Such greetings signify a wish and blessing that peace be with the recipient, and besides their spontaneous uses they have certain ritualized or formalized uses long established in liturgy. Many denominations use other forms of greeting to serve equivalent purposes; they include handshakes, gestures, and hugs, any of which may be called a sign of peace.