The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
Doctoral Degree in Applied Computer Science in Portugal
1 Results in Applied Computer Science, Portugal
The basic premise of doctoral study and, consequently, the PhD course in Informatics is the production of new knowledge through original research.