what is the difference between ability and capability?

Both words have almost same meaning. There is subtle difference. ability is a quality of mind or body. Ability refers to the current position. Capability is possibility in future. If you can sing well now, this is your ability to sing. But if you cannot sing very well now but can be an excellent singer after training or practice, you are capable excellent singer.

http://des.emory.edu/mfp/AbilityCapability.html

Well explained Gulshanji. Really wonderfully you cleard my doubt.Thank you

ability is what actually you are doing and capability is what you can do,potential that lies within you. Basically your current achievement is because of your ability but if someone feels that you can achieve much more than this then he is talking about your capability.

Wow You have clear explanation vidhi , thank you so much dear

ability means that you are going to done that thing and acability means that you are do that.

Thanks gulshan ji and vidhi for clearing the boubt. excellent definition. thanks.

Nice defination provided by Gulshanji about ability and capability.

Thank you guys I clearly understood the difference. Ability is past and present tense and capability is future tense