CPM – Cost per thousand page views
usually associated with an advertising placement, in Google AdWords and some social advertising platforms like Facebook, paying for impressions is an option.
CPC – Cost per click
In most self-serve advertising products, such as Google AdWords, CPC bidding is the main structure
CTR – Clickthrough Rate
Amount of users who click based on how many see the unit
CPA – Cost Per Acquisition (typically of a lead or sale)
total cost of a placement per conversion
PPC – Pay per Click
Pay only when your ad receives clicks
CRM – Customer Relationship Management
All the methodologies that help businesses deal with customers, often discussed in SEM to discuss how to integrate lead data into a company’s CRM software system, and measure leads all the way to close. Integration of leads from SEM efforts into a company’s CRM system can sometimes be a challenge.
Here’s a definition from SearchCRM: http://searchcrm.techtarget.com/definiti…
SEM – Search Engine Marketing
The superset of all marketing using search engines. Often, people use SEM to mean PAID search marketing only, but the more correct description is that SEM is an umbrella for PAID, ORGANIC (SEO), and other search engine efforts.