Hello @Mayankumar, Search Engine Optimization (SEO) is the process of improving any website and online presence and rankings in search engines like Google. It's one of the most crucial parts of Digital Marketing that can help to bring lots of organic and targeted traffic/customers from Search Engines. But it requires lots of knowledge and efforts to do proper SEO by following Search Engines Guidelines. Most of the online entrepreneur or businessman does not have sufficient knowledge of SEO that's why they are using many SEO software like https://sitechecker.pro/ , Ahrefs, SEM rush etc. These tools help to implement the right SEO steps and reduce their work time. So It can tell that any online business success depends on their SEO health. So, I think after getting this information you will understand the importance of SEO in digital marketing.