If you’ve ever found yourself scratching your head at a 3-letter acronym in an ecommerce related article or document, this post is for you. We’ve compiled 99 of the most common 3 letter acronyms you’ll find in online business, from a wide range of functions including IT, marketing, web development, SEO, web analytics, web design and logistics. Roll over any acronym to see its title, or click its link to see a full definition. Or quiz yourself, and see how many of these acronyms you know off the top of your head!

3PL3rd Party Logistics
AOVAverage Order Value
APIApplication Programming Interface

B2BBusiness-to-Business
B2CBusiness-to-Consumer
B2EBusiness-to-Employee

BOMBill of Materials
BPABusiness Process Automation
BPMBusiness Process Management

CDNContent Delivery Network
CMSContent Management System
CODCash on Delivery

CPACost Per Action
CPCCost Per Click
CPICost Per Impression

CPMCost Per Mille
CRMCustomer Relationship Management
CROConversion Rate Optimization

CSCCard Security Code
CSEComparison Shopping Engine
CSRCustomer Service Representative

CSSCascading Style Sheets
CTRClick Through Rate
CVCCard Verification Code

CVVCard Verification Value
DFOData Feed Optimization
DIMDimensional Weight

DNSDomain Name System
DOMDocument Object Model
DTPDays to Purchase

EAIEnterprise Application Integration
EDIElectronic Data Interchange
ERPEnterprise Resource Planning

FAK Freight All Kinds
FAQFrequently Asked Questions
FTPFile Transfer Protocol

FUDFear, Uncertainty and Doubt
HCIHuman Computer Interaction
ISPInternet Service Providers

KPIKey Performance Indicator
LPOLanding Page Optimization
LSALatent Symantic Analysis

LSILatent Symantic Indexing
LTLLess Than Truckload
LTVLifetime Value

MMSMultimedia Messaging Service
MP3MPEG-1 Audio Layer-3
MVTMultivariate Testing

NLPNatural Language Processing
OOSOut of Stock
OPMOutsourced Program Management

ORMOnline Reputation Management
PCIPayment Card Industry
PHPHypertext Preprocessor

PIMProduct Information Management
POSPoint of Sale Terminal
PPCPay Per Click

QSAQualified Security Assessor
RDFResource Description Framework
REPRobots Exclusion Protocol

RFIRequest for Information
RFPRequest for Proposal
RFQRequest for Quotation

RFTRequest for Tender
RIARich Internet Application
ROIReturn on Investment

RSSRich Site Summary
SASStatistical Analysis System
SEMSearch Engine Marketing

SEOSearch Engine Optimization
SKUStock-keeping Unit
SLAService Level Agreement

SLR
SMOSocial Media Optimization
SMSShort Message Service

SOAService Oriented Architecture
SOWStatement of Work
SSIServer Side Includes

SSLSecure Sockets Layer
TCOTotal Cost of Ownership
TLDTop Level Domain

TLSTransport Layer Security
TOSTerms of Service
TPLThird-Party Logistics

UCEUnsolicited Commercial Email
UGCUser Generated Content
USPUnique Selling Proposition

UVPUnique Value Proposition
VARValue Added Reseller
VATValue Added Tax

VTPVisits to Purchase
VTRView-Through Rate
WAIWeb Accessibility Initiative

WAOWeb Analytics Optimization
WAPWireless Application Protocol
WMLWireless Markup Language

WMSWarehouse Management System
W3CWorld Wide Web Consortium
XMLExtensible Markup Language