If you watch videos or read posts by people who build software, Linear comes up constantly, and usually without any explanation. That is because in tech companies it is as ordinary as Excel is in a finance team. Nobody explains it because nobody remembers needing it explained.
Linear is where a software team writes down everything that needs to be done: new features, bugs to fix, small improvements. Each piece of work becomes a Linear ticket, which is simply one task written down, with a description, a person responsible, and a status like "todo", "in progress" or "done".
If you have used Trello or Asana, you already understand the idea. Linear is the same concept, just designed for engineers: faster, more keyboard-driven, and connected to the tools developers use to write and ship code.
Why you keep hearing it
AI tools can increasingly do work inside Linear: read tickets, write them, update them, even pick up a ticket and attempt the task. So when someone says "the agent picked up a Linear ticket", they mean the AI took one written task off the team's to-do list and started working on it.
What it means for you
You do not need Linear. But when someone in a video says "I made a Linear ticket for it", you can now translate: "I wrote the task down so it gets done."