Firewalls currently represent one of the elements of computer security for business networks due to their characteristics and qualities in terms of information and data protection, which are one of the most outstanding strategic and operational elements for any organization seeking to be competitive. Given this, this research work starts from a literature and literature review methodology where it is investigated and expounds on the different considerations related to firewalls, their characteristics and typologies. As well as the implementation of the same in different organizations varied among themselves to show the variety of application that this tool has around computer security. Finally, the results, conclusions and recommendations found regarding the issue of firewalls are reflected, as well as the perspectives and considerations regarding new studies that must be taken into account to expand the issue.