Try not to use abbreviations but here are some that come up regularly.

CMS

Content Management System – the system you as an end user might use to edit your site upload images etc.

DNT

Do Not Track – a setting in your browser that informs sites that you visit that you wish to avoid third party tracking.

LAMP

Linux, Apache, MySQL, Perl/PHP/Python a set of software used to create a web site

LMS

Learning Management System – the system you would use to manage an e-learning education or training program

MySQL

A widely used database often used as part of a LAMP stack

PostgreSQL

A database system that is an open source database with some specialist geospatial features.

SQLServer

A database owned by Microsoft