An invocation (from the Latin verb invocare "to call on, invoke, to give") may take the form of:
As a supplication or prayer it implies to call upon God, a god or goddess, a person, etc. When a person calls upon God, a god, or goddess to ask for something (protection, a favour, his/her spiritual presence in a ceremony, etc.) or simply for worship, this can be done in a pre-established form or with the invoker's own words or actions. An example of a pre-established text for an invocation is the Lord's Prayer.