SEO and SEM are important digital marketing strategies. SEO is the process of improving a website to rank higher organically in search engines through on-page and off-page optimization tactics. SEM is a paid form of advertising where advertisers bid on keywords and ads are shown in search engine results. The top digital marketing companies in India that provide SEO and SEM services are Pinstorm, Techshu, Reprise Media, Ogilvy PR, iStrat, K Web Maker, Webchutney, JWT, McCann Erickson India, and Lowe Lintas.