This document provides an overview of online dispute resolution (ODR). It discusses how ODR emerged in the 1990s with early projects using online mechanisms to resolve disputes. ODR allows for ADR methods like negotiation, mediation, and arbitration to occur online. The document outlines how ODR has expanded and been explored by various organizations. It also notes that the EU has taken legislative measures supporting the use of ODR. While ODR aims to improve access to justice, more research is still needed on its effectiveness compared to traditional offline dispute resolution.