First be reconciled to your brother, and then come and offer your gift.
What you will see
Near the Eucharistic prayers, the deacons call the people to greet one another with a holy kiss. Someone near you may extend both hands in a gentle passing gesture. In some places, people bow slightly. Local practice varies.
Why it comes before Communion
The Church does not approach the chalice as isolated individuals. The Kiss of Peace reminds the faithful that Communion is joined to reconciliation, forgiveness, and unity in Christ.
How to participate
If you feel unsure, watch the person next to you and use the simplest version. You can also bow politely and keep your hands close. The gesture should be peaceful, modest, and attentive to the Eucharistic prayer that follows.
The Kiss of Peace is therefore more than a greeting. It is a liturgical confession that the Church approaches the holy mysteries as one reconciled body, asking God to make peace real before Communion.
Its outward form may be small, but its place in the Liturgy is spiritually weighty.