This is dynamic url. Before can something also. The dynamic may varry time to time depends on content load.
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Be careful about this type of unknown URL/ link. Sometimes, with this code/ using symbols there might be hidden key logger or something like that which can be harmful.
@selena15, on which website did you find this. What browser are you using now? Is your system updated? Is there an antivirus installed?
URL parameters differentiate a dynamic URL from a static URL.
In general, Dynamic URL is generated at the moment when a user submits a search query. For instant return, it is generated with the stored data on the server/ application.
Keep in mind, it is not stored as a whole on the relevant server.