The Environmental Impact Assessment, often known as the EIA, is an essential process that is designed to evaluate the potential environmental repercussions of proposed projects before they are put into action. An examination of the key operational principles of the EIA process is presented in this article, with an emphasis placed on the significance of these concepts in promoting sustainable development. Purposiveness, rigor, practicability, cost-effectiveness, and public participation are some of the topics that are discussed. The Environmental Impact Assessment (EIA) process ensures that environmental considerations are included into decision-making by adopting these principles, which in turn reduces the risk of adverse consequences on the environment. The purpose of this article is to examine the role that legal and institutional frameworks play in facilitating effective Environmental Impact Assessments (EIAs) and to assess case studies that highlight how these frameworks are actually put into practice. Throughout the course of the article, topics such as the relevance of Social Impact Assessment, the need of environmental audits, and the development of new technologies in Environmental Impact Assessment are discussed. The purpose of this article is to underline the need of adhering to the fundamental operational principles of Environmental Impact Assessment (EIA) in order to achieve environmentally responsible and sustainable development. This is accomplished via a comprehensive literature review and analysis.