What is better an Intel Pentium III or an Intel Celeron?
Celeron doesn't refer to any particular processor series.
Celerons were cost-reduced versions of their Pentium equivalents.
The Celeron in question could be based on a Pentium 2, Pentium 3,
Pentium 4, Pentium D, or Core 2 Duo. In which case the answers
would be "Pentium 3, Usually Pentium 3, Celeron, Celeron, and
Celeron", respectively.