The Common Technical Document (CTD) standardizes the submission format for drug registration applications in the ICH regions (U.S., Europe, Japan), enhancing the organization, review, and approval process. Created to avoid duplicative testing and streamline regulatory submissions, the CTD comprises five modules detailing general, quality, non-clinical, and clinical information. The electronic version (eCTD) further simplifies submissions and improves data management, although variations in regional legal requirements and guidelines remain challenges.