Psychotherapy explores and addresses the underlying issues that might have caused the symptoms to manifest.
It deals with deep-rooted issues and ongoing patterns of behaviour that lead to depression, anxiety and feelings shame or guilt for example.
Depending on the cases. Psychotherapy might last longer than counselling.
The level of skill and training between counselling and psychotherapy is quite a significant in the sense that psychotherapist trains for longer at a post-graduate or masters levels and they have an in-depth level of mental health diagnosis.