Does anyone have any real life examples of what this could be used for? I get what it does, just not quite sure where it fits in. For example, do I push data

Does anyone have any real life examples of what this could be used for? I get what it does, just not quite sure where it fits in. For example, do I push data into S4, does S4 poll for data. Is this like a distributed task system, where I distribute my tasks evenly across multiple servers seamlessly?