# Events

Dicover the different ways to use events in CQL.

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Use the summary below to quickly jump to a specific topic:

- [Overview](/reference/cql/expressions/events/overview): Learn how to use event expressions in CQL.
- [Criteria](/reference/cql/expressions/events/criteria): Discover how to write criterias in CQL.
- [Quantifier](/reference/cql/expressions/events/quantifier): Learn how to use quantity-based filters in event expressions.
- [Time window](/reference/cql/expressions/events/time-window): Learn how to use time-based filters in event expressions.
- [Event types reference](/reference/cql/expressions/events/event-types): Discover the event types available in CQL.