Search Engine Forums, SEO Forum

SEO = search engine optimization

SEM = search engine marketing

PPC = pay per click (Google adwords advertising)

SEM: SEM stands for search engine marketing. It is the broad term used for marketing it includes other terms as PPC, CPC, SEO, SMO etc...
SEO: SEO is search engine optimization as the name suggests it used for optimizing any website on search engine.
PPC: It is pay per click. PPC used for online marketing purpose but you can also earn money from PPC.

SEO (Search Engine Optimization) - SEO is the process of optimizing your web site for the purpose of getting free traffic from search engines.

SEM (Search Engine Marketing) - SEM is a broader term than SEO, and is used to encompass different options available to use a search engine’s technology, including paid ads.

PPC Advertising (Pay-Per-Click Advertising) - Pay-per-click advertising means that you pay each time a potential customer clicks your ad.

SEM – suggests that everything that is connected with internet promoting in search engines. SEM may be a word that has countless terms, names of services and merchandise.

SEO may be a method that improves the standard and therefore the amount of the traffic returning to optimised web site from organic search.

PPC may be a model of charging for advertising on search engines and websites. Since the strategy became popularized by search engines, it caught on to outline paid advertisment by PPC in search engines i.e. paid listing.

SEO stands for search engine optimization. It is used to improve rank and traffic of a website.
SEM stands for search engine marketing. It is most often referring to paid search.
PPC stands for pay per click and is used in online advertising.