Most endpoints that work with collections allow to filter the results based on certain properties. This is a powerful tool to save bandwidth and time by avoiding manual filter processes on the full result set.
Please note that different filters can be combined but each specific filter has to be unique (e.g., ?equal[x]=a&equal[y]=b works but ?equal[x]=a&equal[x]=b does not). Multiple filter conditions are AND-connected.
All available filters are documented in the API specification.