The idea behind discovery is that both sides should share information before going to trial. That way, a trial can proceed smoothly, without parties requesting information from each other and otherwise holding up the process. During the pre-trial phase of filing a lawsuit, discovery, you will be asking for information from the other party and responding to their inquiries as well.
Discovery, in the law of common law jurisdictions, is a pre-trial procedure in a lawsuit in which each party, through the law of civil procedure, can obtain evidence from the other party or parties by means of discovery devices such as a request for answers to interrogatories, request for production of documents, request for admissions and depositions. Discovery can be obtained from non-parties using subpoenas. When a discovery request is objected to, the requesting party may seek the assistance of the court by filing a motion to compel discovery.