Your profile page shows you having a Disco 2, in which case there were some versions sold with steel coiled springs on the rear and other, mainly the seven seat version were sold with air suspension, also known as Self Levelling Suspension.
The simple way to tell which is on your vehicle is to just look at the rear axle, if there are coiled springs between the axle and the chassis then you don't have air suspension.
Some owners think that the SLS system is the work of the devil and should be ripped off and buried in a deep hole at the earliest opportunity. I and many others disagree, it's a good system and it's easy to understand. the main thing to remember is that the air springs or air bags should be treated as "service items" and changed every 5 years or so.
As for the lift, that's a mistake that many people make, fitting the lift before they get to know how the vehicle feels and works. A poorly fitted lift will adversely affect the handling of the vehicle.
Before you go for lifting, you must ask yourself some questions, not least is why you feel you need to lift the thing.
To find out more about lifting a Disco 2, take a look at this thread:-
https://www.landyzone.co.uk/land-rover/lifting-a-d2-properly.300573/#post-3749057
Fitting a lift by changing to steel springs instead of air bags will result in you losing the self levelling system as well as the ability to raise the suspension with just a flick of a switch on the dashboard.
There are some 2" lift blocks available for the air suspension which allow you to retain the air suspension facilities.
