The primary function of registering domain names online is to obtain a unique address for a website that allows users to easily access it via the Internet. A registered domain name serves as an identifier for an organization, business, or individual, establishing an online presence and brand recognition. Domain registration also prevents others from using the same name, ensuring exclusivity. This process usually involves selecting a relevant domain name and choosing a domain registrar to secure ownership, which is essential for effective online marketing and business operations.