After you have performed a query, sometimes it will be useful to save the query for later use. For example, you might have created a query to list all open bugs and new features in a project that are to be completed by a certain date in several projects, so you can keep an eye on their progress. Instead of recreating this search query every time you want to check on the statuses, you can save the query as a filter, which can be reused at a later stage. You can think of filters as named search queries that can be reused.
Other than being able to quickly pull up a report without having to recreate the queries, saving search queries as filters provide you with other benefits including: