What Is eDiscovery? A Plain-English Guide

What is eDiscovery? Electronic discovery, or eDiscovery, is the process of identifying, preserving, collecting, reviewing and producing electronically stored information (ESI), such as email, chat messages, files and databases, when it is requested in a lawsuit or investigation. It is the part of litigation where software matters most, because the volume of data in a modern dispute is far too large to read by hand.

This guide explains where eDiscovery comes from in the federal rules, the standard model that describes its phases, and what eDiscovery software does. It describes rules and practices. It is not legal advice.

Where eDiscovery Comes From in the Rules

In US federal courts, discovery is governed by the Federal Rules of Civil Procedure. Rule 26(b)(1) lets parties obtain discovery of any nonprivileged matter that is relevant to a claim or defense and “proportional to the needs of the case.” The rule lists the factors that bear on proportionality, including the importance of the issues, the amount in controversy and whether the burden or expense of the discovery outweighs its likely benefit. Proportionality is why eDiscovery disputes so often turn on cost.

Preservation is the other pillar. Rule 37(e) addresses ESI that should have been preserved in the anticipation or conduct of litigation but was lost because a party failed to take reasonable steps to preserve it. If the loss prejudices another party, a court may order measures no greater than necessary to cure the prejudice. The harshest consequences, such as an adverse inference instruction or dismissal, require a finding that the party acted with intent to deprive the other side of the information.

State courts have their own rules, many modeled on the federal ones. The Sedona Conference, a nonprofit research group, publishes The Sedona Principles, now in their third edition, which set out best practices, recommendations and principles for electronic document production.

The Phases of eDiscovery

The most common map of the process is the Electronic Discovery Reference Model. EDRM 2.0, released September 1, 2026, defines nine phases: identification, preservation, collection, processing, review, analysis, production, presentation and a new disposition phase covering what happens to data after a matter ends. EDRM says the model was developed by about 150 practitioners and now sits on top of its Information Governance Reference Model.

Two changes in the 2.0 model are worth knowing. It groups identification, preservation, collection and processing into a “data acquisition” framework, and it describes a deliberate “left lean” toward early case assessment and targeted scoping. In practice, that means the cheapest place to control an eDiscovery budget is before data is collected, not during review. EDRM also stresses that the model is conceptual, so teams repeat and reorder steps as they learn more about the data.

The legal hold sits at the start of this process. When litigation is reasonably anticipated, organizations typically issue a hold notice telling custodians to preserve relevant information. Legal hold software tracks who received the notice and whether they acknowledged it.

What eDiscovery Software Does

eDiscovery platforms handle the phases that are impractical by hand. Processing tools extract text and metadata from many file types and remove duplicates. Review platforms let lawyers search, tag documents for relevance and privilege, and redact. Most now include technology-assisted review, which uses machine learning to rank documents by likely relevance, and newer generative AI features that summarize documents or answer questions about a collection.

Vendors range from software sold directly to firms and corporate legal teams to service providers that run the whole process. The service market is consolidating: our coverage of Repario buying UnitedLex and Control Risks spinning off its eDiscovery arm shows two large providers changing shape within three weeks. Microsoft also offers eDiscovery inside Microsoft Purview for organizations whose data lives in Microsoft 365, which is why “what is eDiscovery in Microsoft Purview” is a common search.

For buyers, the main questions are where the data sits, how volume is billed, who can run defensible collections, and how review decisions are documented if they are challenged.

Common Questions

What does eDiscovery stand for?

Electronic discovery: the discovery of electronically stored information in litigation, investigations and regulatory matters.

What is the difference between discovery and eDiscovery?

Discovery is the full pretrial exchange of information, including depositions and paper documents. eDiscovery is the part that deals with electronic information.

What is an eDiscovery hold?

A legal hold is a notice telling people to preserve information relevant to anticipated or pending litigation. Federal Rule 37(e) addresses what can happen when ESI is lost because reasonable steps were not taken.

What does an eDiscovery paralegal do?

Typically, they help manage holds, collections, review platforms and productions under a lawyer’s supervision. Duties vary by employer.

What to Watch

The EDRM 2.0 emphasis on early scoping and disposition reflects where costs are moving. Watch how generative AI review features are documented and accepted when the other side questions them, and whether consolidation among service providers changes pricing for midsize matters.