Big Data is the term that describes the large amount of data, both structured and unstructured, that abounds today.
It is also the basis of Machine Learning, automatic learning and Deep Learning, deep learning. Both are the basis of Artificial Intelligence. Through mathematical algorithms they try to detect patterns to automatically understand and improve that algorithm, with which they are already programmed, and in a certain way make the computer learn autonomously.
On the other hand, we also have Data Science that takes Big Data as its pillar.
This is just an overview of everything that arises from initial, basic tools like probability and statistics.