A red team exercise challenges the blue team’s capabilities and technology to detect, respond, and recover from a breach. Red team simulation can include all stages of an attack from initial access to impact and even reconnaissance performed in the pre-attack stage. The benefits of red team simulation extend beyond operational efficiency for both in-house red teams and companies that provide red team services. Red team automation can support red team activities, but the value is limited, and most red teams have their own set of homegrown tools developed for the same purpose.
Source: https://thehackernews.com/2020/09/red-team-penetration-test.html