Special stock (I'm at a loss of english financial terms here) that give off a certain percentage of value back to you each year or month.
So the goal is the same, once you own enough of these stock you're supposed to live off the accumulated winnings from them. And of course these stock can be sold off too if you want to free some money. Or if the company announces that they're going to lower their percentage of value that they give out.
I've been doing this for a couple of years now, started late compared to my peers. I'm a slacker and so far haven't calculated much of anything. Simply jumped on a bandwagon, read some blog posts and got started.
But a co-worker who tipped me off to this "movement" claims he's calculated that he will be able to live off his return in 10 years.
This all depends on how much you're putting into your stock each month of course. Personally I buffer money and only buy stock every 3-4 months.
The trick is to find old well established businesses whose stock has been stable for many years, many of them fluctuate up and down over decades.
New companies do not tend to give off this return. I don't know the details but only certain companies give a return on their stock just by owning them. My stock trading app shows this info when you click on a stock.
Once you've bought into some company you might get a letter home saying that they're going to lower or raise the return depending on how well they're doing.