Explain the function of entry-sequenced data set?

The major function of an entry-sequenced data set is to identify the dataset and then enable its access to the physical location. It also specifies the byte address for every dataset and displays the relationship at the beginning of dataset. Thus, every dataset is ordered sequentially for easy maintenance of records. A person can access the dataset using the physical location based upon the order of entry. As the records are related to the byte address these cannot be deleted. However, the addition of records is possible.