Since the issuance of the Geneva Conventions in 1949 there has been a latent confusion in States undergoing internal violence situations related to whether or not non-international armed conflicts exist in their national territories, given that neither Article 3, common to the Conventions, nor the Additional Protocol II of 1977, define what a conflict is. Thus, this research document aims to clarify this matter by means of an analysis of the law, case law, and current legal principles, defining what the application margin is for the International Humanitarian Law to non-international armed conflicts. Afterwards, we aim to clarify another common question: Does International Humanitarian Law apply exclusively to Party States, or does it also apply directly to non-state agents? Finally, this document aims to briefly propose a plausible solution to the problem regarding the confusion created by the lack of a clear definition of armed conflict. Said issue clearly harms the protection that during conflicts must be given at all times to hors de combat or protected population.