When using information and communication technologies, the data transparency of the users is taken for granted. Inadvertently handing over our information to third parties is a common, ongoing, and widespread practice globally. Smart devices, browsers, websites, mobile applications, and social networks are all interconnected through the collection of their users" data.The book you hold in your hands briefly explains the elements that gave rise to this industry, who collects the data, the mechanisms employed, the risks involved, and the consequences that its use can generate, particularly for children and adolescents. A sustained exchange presented as an interview with ChatGPT 4.0, the popular artificial intelligence language model created by OpenAI, is also included. And thus, within this context, some suggestions are offered to allow us to enjoy the best that technology has to offer without unwanted intrusions into our personal privacy.