Products can be setup to use Batches on an individual SKU level by setting them to use an Inventory Model where Batch Mode is set to Active or Strict. You may choose to have multiple Models that are used for batches, for example because some products have batches based on a best before date, whilst others use a lot number.
Batches can be used in conjunction with bins to create powerful inventory management systems. For example, the below diagram shows how 3 batches of “Beef” are spread out over 3 bins, with batches found in multiple bins.