Artificial Intelligence is a reality in our days, and it is used in multiple ordinary tasks, such as text translation, virtual assistants as Alexa, music recommendation in similar platform to Spotify or film recommendation in similar platform to Netflix or HBO, or facial recognition. Regarding facial recognition, there are multiple platforms that are integrated into our society and we are using them every day. A wonderful example of facial recognition is already a reality, is in our smartphones. Lots of them have facial recognition for being unlocked and this application of artificial intelligence is very useful because the smartphones are a tool that we use every day for communicating and where we keep important data such as data from banks or the key of our life as the access to our social media, such as Facebook, Instagram, WhatsApp, etc. Facial recognition also is used in smartphones in our photos, because some smartphones have the capacity of recognizing faces, and with the help of machine learning semi-supervised, it might be classified the photos in our own smartphones and labelling people faces, which are kept inside. Then, our smartphones are able to classify all different photos and assign a proper label. The company that made great progress in this field was Facebook. They can classify pretty well the photos that are uploaded on social media using the historical. Besides, Facebook can suggest who are the people that turn up in the new photos that it just is upload.