Concentrate, Exploration, Manipulate
Source Player Core pg. 198
You create a disguise to pass yourself off as someone or something you are not. Assembling a convincing disguise takes 10 minutes and requires a holoskin or similar disguise, but a simpler, quicker disguise might do the job if you're not trying to imitate a specific individual, at the GM's discretion.
In most cases, creatures have a chance to detect your deception only if they use the Seek action to attempt Perception checks against your Deception DC. If you attempt to directly interact with someone while disguised, the GM checks your Deception check result against that creature's Perception DC instead.
If you're disguised as a specific individual, the GM might give creatures you interact with a circumstance bonus based on how well they know the person you're imitating.
Success You trick the creature into thinking you're the person you're disguised as. You might have to attempt a new check if your behavior changes.
Failure The creature can tell you're not who you claim to be.
Critical Failure The creature can tell you're not who you claim to be, and it recognizes you if it would know you without a disguise.
Using a holoskin or shapeshifting abilities may allow you to disguise in less time, but assuming a new disguise can still take 10 minutes to get into character and practice your mannerisms as this new creature, at the GM's discretion.
You can use this skill to pretend to be someone else on the infosphere. Still, without a hacking toolkit anyone can use the Hack action to uncover your identity without having to compare it to your Computers DC.