What is a dataset?
A dataset is a tabular information composed of rows and columns.  Each column will have a name that describes the data in that column along with an assigned datatype to describe the data that is the column.  Common datatypes are string, int, and double.  The total number of column in the dataset is called the total rows, and the total number rows is referred to as total row count.  All of these attributes together are what we call a dataset.  Datasets come into different forms too - batch, real-time, and static.