e-Discovery describes the electronic component of identifying, collecting, and providing the electronically stored information (ESI) identified by a legal hold. The scope of information included in e-Discovery can be vast and include everything from files, emails, logs, text messages, voicemail, databases, and social media activity. The scope of information requested in an e-Discovery request can be difficult for many organizations to comply with. For organizations that are involved in regular legal activities, generally large organizations and government, specific strategies are often employed to defend against e-Discovery requests. Defenses often include well-crafted data retention policies that define stringent periods for which data can be retained. However, data retention polices cannot conflict with existing laws that dictate retention periods.
From the CASP+ official comptia study guide