A line is just a straight number of cells in desk, a data, or spreadsheet. Each column has unique identification in which data can be stored. Column are mostly used to record numeric data for calculations but any kind of data can be recorded in it as they appeared from top to bottom shape.

Each row would provide a data value for each column and would then be understood as a single structured data value, in this case representing a company. More formally, each row can be interpreted as a relvar, composed of a set of tuples, with each tuple consisting of the two items: the name of the relevant column and the value this row provides for that column.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.