Hack The Box is a cybersecurity training and upskilling platform founded in 2017, serving individual practitioners, enterprises, government organizations, MSSPs, and universities. The platform combines gamified learning environments, hands-on hacking labs, live-fire simulations, and AI-enhanced tools to help users develop both offensive and defensive cybersecurity skills. The platform's product suite is segmented by audience. For individual learners, it offers HTB Academy (structured learning paths), Hacking Labs, Pro Labs, Capture The Flag (CTF) competitions, and an InfoSec Careers portal. For businesses, it provides Dedicated Labs, Professional Labs, Business CTF events, Workshops & Seminars, and a Talent Search feature for hiring. University programs are also available for academic institutions. HTB issues industry certifications through its Academy, including CPTS (Certified Penetration Testing Specialist), CBBH (Certified Bug Bounty Hunter), CDSA (Certified Defensive Security Analyst), CWEE (Certified Web Exploitation Expert), and CAPE. In 2025, the company launched Threat Range, an AI-powered simulation environment, and acquired LetsDefend, a defensive security training platform. As of 2025, Hack The Box reports over 4.3 million platform members, 1,500+ organizations trained, 742 training labs, and support for 1,200+ CTF events. The company has raised a total of approximately $66.9 million in funding, including a $55 million Series B led by Carlyle in 2023. It employs 290+ staff globally, with the largest concentration in Greece. Hack The Box has been recognized in the Forrester Wave for Cybersecurity Skills and Training Platforms (Q4 2023).