 Let's first define a concrete problem where time series is useful. So, that's step one. Think about your grandma. She started this laptop repair line two years ago and it's a hit. The way it works is a customer places an order request online, the customer then ships the broken laptop to grandma, then she and her workers fix them and the laptops are sent back. The problem here is her workers are paid by the hour. If there are more laptops to repair grandma calls in more workers, but as you can imagine it's hard to know how many workers we need without knowing the number of laptops that we get per day. Now grandma hired you as a data scientist and you think what could be useful to know for grandma is how many laptops are we going to receive tomorrow.