CAT stands for computer-assisted translation, also known as computer-aided translation. These translation tools are invaluable for professional translators and significantly improve the consistency and speed up translation projects.
CAT tools are software applications that support text translation from one language to another. More specifically, CAT tools for translation are used for submitting, editing, managing, and storing translations.
They’re also frequently used by individual translators and bilingual employees who work for organizations that have global audiences or have extensive localization needs. Overall, it’s estimated that CAT tools are used by more than 86% of translators.
Localazy is a complete localization suite and includes CAT features to help you or your translators with their work.
You might be interested in: 
Intro to Localazy from translator’s perspective
Documentation: Getting started with Localazy
Documentation: Translating strings