The Xbox Series S and X are the latest generation of Xbox consoles. There are some key differences between the two consoles which might help you decide which console suits your needs.
The main difference between the Series S and Series X console is that the Series S is all digital and does not have a disc drive for it to take discs or DVDs.
This means that there are only two ways to get games for the Series S console. Either purchase games in the Microsoft Store, or to get games on Xbox Game Pass. You will need to subscribe to Game Pass to get access to games for a monthly fee.
The Series S has the typical rectangular shape that we have come to expect from consoles. Where the Series X is has a larger boxy design. While it has normally been displayed in it's upright position, the Series X can still be used on it's side - as long as it has the room for airflow.
The Series S has a 512GB SSD of internal storage while the Series X has a 1TB SSD of internal storage, meaning it has double the storage.
(Both consoles support external USB 3.0 drives and above. However, please note that external hard drives won't work with the faster loading times of the internal/Storage Expansion Card, nor enable any Xbox Series X/S optimisations on games. They are best used, therefore, to store Xbox One, Xbox 360 and original Xbox games.)
The Series X has True 4K gaming resolution capability, while the Series S is optimised for 1440p gaming. This is a fancy way of saying that the Series X will always deliver a clear 4K image for games. However if you don't have a 4K TV, the Series S will definitely deliver in this aspect. While the Series S can't do 4K gaming, both consoles can stream 4K media and streaming.
Both consoles use the new Series X Wireless controllers, which will also work with the older Xbox One, One X and One S consoles.
The Series S is the more affordable and accessible option and can still give you a great next gen console experience, however you may be limited in the way you purchase and access games. The Series X console is the full next gen experience, with consistent 4K gaming and video and larger storage for more games.