A service account is a special type of account that is used to run tasks on behalf of a user or application. It is typically used for batch processing jobs, as it allows the jobs to run without the need for a human user to be logged in.
In this case, the company needs to migrate the storage system and batch jobs from the local storage system to a public cloud provider. The batch jobs will need to be able to access the storage system on the cloud provider, so a service account will need to be created to run the jobs.