Preface

The World Wide Web has been with us for the past 20 years and has become a fundamental part of our lives. Its distributed architecture has proven to be efficient and scalable. Thanks to it, nowadays, an incredible amount of information and services is available to all of us. We just have to connect, look for what we need, and pull it onto our devices to use it. However, it's also true that many scenarios would be more efficient if services themselves were able to determine the information that we need and then push it towards us at the right time. The contrast between these two ways of distributing content is clear and important, and according to the specific goals, there might be a clear advantage in using one or the other.

We already ...

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