What is the difference between data and internet?

On my mobile phone there seem to be different charges for 'data' and 'web browsing'. What is the difference or are they the same thing?What is the difference between data and internet?
Do you mean an actual menu option on your phone, or on your bill?

[Although networks can provide charge advice upon call completion, they rarely implement this, because of the huge number of tariffs, which are separately calculated by their billing systems (contract) or their prepay systems.

I think it's unlikely therefore that your phone's internal software is processing AOCI or AOCC information from the VLR/MSC you're registered on]

In bills, it probalby depends on your network operator, and from the information you've provided, I'm guessing they only give you a bill summary, rather than a breakdown/full itemisation.

It's likely that the "data" it refers to is SMS and MMS messaging (unless you're using circuit-switched fax or data services - pretty unlikely, I suspect).

Typically, networks have voice, old data 1 (SMS and MMS), old data 2 (circuit-switched data and fax) and new data (mobile internet, mobile broadband, private VPNs).