| 1-Tier Architecture | A simple form of stand-alone application architecture where all business logic resides in a single application. Contrast with 2-tier and 3-tier architectures. |
| 2-Tier Architecture | Applications with business logic separated from the database management system. Application code resides on the client, which is used to process data, and input and output resides on the database. |
| 3-Tier Architecture | An architecture where the user interface, business application logic, and data are separated. User interfaces handle the presentation layer and present a view to data. Application servers handle the application logic, processing, and database management and database management systems handle the data. This design reduces complexity and provides scale for additional users or data. Examples include "thin-client" web applications and "fat-client" desktop applications. |
| 3PL | See Third-Party Fulfillment
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| 3rd-Party Warehouse | See Third-Party Warehouse |
| 404 Error | When a client's browser requests a webpage and the web server does not have that page available, the server returns a 404 Error which states that the file you are looking for was not found. Reasons for this could be that the name of the file or directory was misspelled or that the file / page / directory does not exist. |
| 802.11 | A set of wireless communication specifications for LANs from The Institute of Electrical and Electronic Engineers (IEEE). |
