[hrishivardhan]

They both are the part of the digital marketing let me describe them both one by one:

1) SEO:- SEO is stands for the Search engine optimization. it's a process of optimizing our site to make it user friendly as well as search engine friendly. so our site can rank higher on the Search engines. it has mainly two parts 1) on page activity 2) off page activity

2) SEM:- SEM is stands for the Search engine marketing. it is the process of marketing our site on the paid platforms. yes SEM is totally stands for the paid marketing.

but both are very needed part of the digital marketing they both have their own importance in the digital marketing.