what does ALB mean when it goes on

Not sure what kind of car you have but ALB lights are warning to let the driver know that the Anti-lock brake system is not working. It doesnt mean that you dont have any brakes at all, it means that you are now operating with a normal braking system and your anti-lock brakes have shut off. Anti-lock brakes are a good thing to have especially if you live in a place with snowy winters. They prevent the wheels from locking up and skidding. If you are okay with operating with a normal breaking system then you should be able to turn the light off on the dash by removing the fuse. Hope that helped

it probably means that your anti lock braking system is not working i would check the fuses as soon as possible if i you can't figure it out you should probably get it to a garage as quick as you can that could be dangerous

means there is something wrong with the ABS modulator

Did you just have your brakes serviced? They may have damaged a wheel sensor or not reconnected it. It's happened to some people I know.