Take the tour ×  I am trying to grasp the concept of Semantic
Web. I am finding it hard to understand what exactly is the
difference between RDF and OWL. Is OWL an extension of RDF or
these two are totally different technologies?  share|improve
this question add comment  8 Answers  The semantic web comes in
layers. This is a quick summary of the ones I think you're
interested in.  Update: Please note that RDFS is used to define
the structure of the data, not OWL. OWL describes semantic
relationships which normal programming, such as a C struct,
isn't fussed about and is closer to AI research & set theory.
Triples & URIs  Subject - Predicate - Object  These describe a
single fact. Generally URI's are used for the subject and
predicate. The object is either another URI or a literal such as
a number or string. Literals can have a type (which is also a
URI), and they can also have a language. Yes, this means triples
can have up to 5 bits of data!  For example a triple might
describe the fact that Charles is Harr