Worship is the practice of thanking and praising God for who he is and what he's done. We can worship God for the beauty of creation, his character, or his goodness to us amidst trials. Worship is a transformative experience because it reminds us of God's glory and nearness to us. It's a crucial, joyful, life-giving practice.
We recommend checking out Adele Calhoun's Spiritual Disciplines Handbook, Part I (entitled 'Worship') to learn more. Calhoun teaches readers about specific worship practices (such as communion, song, and gratitude) as well as how to live our lives such that we constantly acknowledge and enjoy God's presence.