What is the difference between e-discovery and litigation support?

Discovery process is a fact gathering process in US civil litigation system. when this discovery process is done through an electronic media, it is called e-discovery, for example through computers.

Litigation support service means any kind of assistance,help or aid done to the process of litigation. Now a days US and other countries are outsourcing some litigation services to India and other countries. They include paralegal services like legal transcription, patent filing, legal research and e-discovery etc.,

Hence e-discovery is one kind of litigation support service outsourced by US to other countries.