Viruses, have been around since the ancient times but still, the exact origin of these simple organisms, with Genetic Information, i.e., RNA or DNA under a Protein Shell is still unknown. However, there are three hypotheses regarding the same:
The Progressive Hypothesis, also known as the Escape Hypothesis, says that the viruses originated from the genetic elements that were able to move between the cells;
The Regressive Hypothesis, also known as the Reduction Hypothesis, states viruses are the remains of the cellular organisms;
The Virus-First Hypothesis says that the viruses evolved simultaneously with their cellular hosts.