Liturgy is a set form of public worship. It is what we do when we gather to worship. Unless your church follows no form or manner of worship, you have a liturgy, too. Some churches follow a more highly structured liturgy than others, but I doubt there are many churches who have no form whatsoever.
Our Sunday liturgy consists of hymns, prayers (some said by all, some said by the priest on behalf of all), bible readings, a sermon, the creed, and of course communion.
-ksen