The State, in the exercise of its public function, and through its agents, can end up acting (or failing to act) in such a way as to cause damage to other people. The most varied types of activities can cause this damage, such as construction activities, the transport of people, and activities involving the use of electricity. These are common situations that can easily occur. However, they give rise to a duty on the part of the state to indemnify those who have suffered damage. Thus, this work provides a general overview of the concepts of non-contractual civil liability, as well as dealing with the theories of state liability, the assumptions and grounds for its characterisation and, finally, delves into liability arising from omission on the part of the public administration.