In a short time, the Internet quickly changed the way we work and the current phase, called the Internet of Things (IoT), will allow the connection of the physical world to the network. This work seeks to know about IoT its generalities, communication, threats and methodologies that counteract the existing dangers. Finally, the increase in connected IoT devices is imminent, which will lead to the creation of new technologies; therefore, attention should be paid to major technological changes, mainly in matters of information security and privacy, since the vulnerability in most IoT devices allows attackers to have remote access to the device or take full control of the system. Due to this growth and the existing problems in IoT, the alliance between companies is necessary to create solutions that allow greater security, and thus, more users implement this technology without fear that their information will be manipulated, an issue that involves the community in general.