While on its face PIP is a guide to getting someone to commit to a higher level of improvement, for many companies its a formal warning that you need to shape up or you're going to be let go.

Performance Improvement Plan, they are not unique to Amazon, most places have them though the process may differ. Not to be too cynical but ultimately they’re a way to document that you’re not meeting expectations - before being fired. Should there be any sort of employment claim later its a mechanism by which an employer can show documentation that any issues related to your being let go were performance related and not some sort of protected status or prejudice.

Outside of someone protected by a labor union, I’ve very rarely seen anyone recover from a PIP and not be eventually let go. Most commonly employees see them as a 30 or 60 day window to proactively find a new job before they’re terminated.

Amazon fires between 5-15% of engineers per year. PIP is to get you to quit. Amazon hires a TON of entry level SDE 1 engineers to sacrifice at the altar of Bezos so more shitty employees get to stay. Lifespan of a SDE 1 whipping boy/girl at Amazon, as a result is 3-6 months.

Performance Improvement Plan. In theory, it sounds like a plan to fix your supposedly inadequate performance. In practice, like 99% of the time it means somebody decided to fire you for some reason before you have even seen the first one, and they're just creating documentation for why they fired you to head off HR requirements and any future complaints. They'll run you through a few rounds of supposedly evaluating your improvements as inadequate and eventually fire you, unless you quit first.

Most likely, Performance Improvement Plan

Performance Improvement Plan. Basically 'this is what you need to improve if you want to keep working here.'

Lots of people bad at their jobs blame the PIP system for their failure at Amazon.