Survival is a mode where you fight as many opponents as possible without losing. If you take damage during a match, only a small amount of it will recover for the next match. This mode made it's debut in Tekken 2 and has been in every Tekken game since.
The opponents get harder every match. However, certain cheap tactics can still allow you to reach over 100 wins. If you get a high score, you will be allowed to sign your initials. Otherwise, you'll get a message saying something along the lines of "You need more practice".
Related ThreadsNew 4 player co-op survival mode - last post by @ Oct 16, 2014
Zombies Survival - last post by @ Jan 22, 2016
[DakadoRotu] Custom zombie survival server - last post by @ Nov 17, 2017
What are the real Survival Mode World Records? - last post @ Sep 19, 2017
Survival weapon selection and basic tactics - last post @ Jan 9, 2013