An extension in a Ph.D. course means an additional year or half-year in order to submit the thesis or the research work. If a candidate fails to submit their thesis within the least duration of the course, they can always opt for an additional year, which is also interpreted as the deadline extension. There’s no shame in getting an extension since there are several factors that can cause a delay in thesis submission. For instance, a highly challenging topic of the thesis, or reduced time dedicated to the research work are the most common factors forcing a candidate to get an extension.