This chapter explores the theoretical underpinnings of e-participation within e-governance and the critical role of ICTs in facilitating public engagement across governmental levels. It highlights the transformation of e-participation from internal functions to inclusive policy-making processes, supported by ICTs to promote participatory, deliberative, and inclusive democracy. The chapter ultimately goes through the various models and frameworks that describe the spectrum of e-participation, addressing the specific challenges and opportunities that arise in e-governance.