SEO (Search Engine Optimization): SEO is a digital marketing strategy that focuses on optimizing a website's content, structure, and various elements to improve its visibility in search engine results pages (SERPs). The primary goal of SEO is to increase organic (non-paid) traffic from search engines. It involves practices like keyword research, on-page optimization, link building, and technical improvements to enhance a website's ranking in search engines like Google.

ISM (Internet Search Marketing): While "ISM" is not a widely recognized acronym in the field of digital marketing, it is possible that in some contexts, it might refer to "Internet Search Marketing." However, "Internet Search Marketing" is not a standard industry term. Instead, digital marketing strategies that focus on promoting products or services through search engines typically fall under the broader category of Search Engine Marketing (SEM). SEM includes both SEO (organic search) and paid search advertising (e.g., Google Ads).