LexisNexis Applied Discovery - What is e-discovery production?

Applied Discovery Services: Production - From LexisNexis's Applied Discovery website: 
"The selection of a format for ESI production is often driven by the legal requirements presented in the Federal Rules of Civil Procedure (FRCP), or the state or local rule equivalents. FRCP 34 (Production of Documents, Electronically Stored Information, and Things and Entry Upon Land for Inspection and Other Purposes) highlights the fact that electronically stored information (ESI) must be produced in forms that are reasonably usable. Requests for production may specify desired data formats for production, but if no specification is made, parties must produce the ESI in the format in which it is ordinarily maintained, or in a reasonably usable form. Parties do not have to produce ESI in more than one format."