2. Glossary
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# 2. Glossary

- Route: Route the basic building block of the gateway. It is defined by an ID, a destination URI, a collection of predicates and a collection of filters. A route is matched if aggregate predicate is true.
- Predicate: This is a Java 8 Function Predicate. The input type is a Spring Framework `ServerWebExchange`. This allows developers to match on anything from the HTTP request, such as headers or parameters.
- Filter: These are instances Spring Framework `GatewayFilter` constructed in with a specific factory. Here, requests and responses can be modified before or after sending the downstream request.

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