BL = BackLinks
CPC = Cost per Click
CPL = Cost Per Lead
CPM = Cost per 1000 impressions
CSS = Cascading Style Sheets
CTR = ClickThrough Rate
FFA = Free For All
FTP = File Transfer Protocol
IBL = Internal BackLinks
IMO = In My Opinion
ISP = Internet Service Provider
KW = KeyWord
ODP = Open Directory Project
PR = PageRank
LOL = Laugh Out Loud
PFI = Pay For Inclusion
PPC = Pay Per Click
PPL = Pay per lead
ROI = Return On Investment
SEM = Search Engine Marketing
SEO = Search engines optimization
SERP = Search Engines Results Page
SERPS = Search Engines Results Pages
SID = Session identifier / Session ID
SSI = Server Side Includes
301 = Permanent server redirect
404 = Page not found