Several SEO agencies and digital marketing firms offer a variety of services. The services aim to boost your online organic traffic by optimizing your rank in the search engine results pages (SERPs). Using keyword research, content creation, and link-building SEO impacts site performance & cost. Before deciding on SEO service, cross-check the SEO price model as SEO firms differ. Factors to consider are per hour, day, month, yearly charge, project, background research, keyword & competitor research, site architecture optimization, content, analytics & reporting, link building & public relations. These services drive the price & cost of quality SEO.