This article collection is the work of more than 50 scientists and Young Reviewers from all around the globe, and even more ecologists that voluntarily translated the English articles into different languages. Our role as editors, together with the authors and translators, was to share our love of soil biodiversity with you. In this collection, you will discover that soils are full of life. We will introduce some of the methods and techniques used by scientists to observe the life below our feet. We will show you that belowground life is essential to have healthy soils and, therefore, for us. However, you will soon realize that belowground life is changing and under multiple threats. The authors will give ideas on how we can protect soil biodiversity and invite you to actively help us in studying and protecting this valuable ecosystem.

Now it is your turn to explore and engage with the content of this Collection. We hope there will be something for all of you!