Double space may refer to any of the following:
1. In text formatting, a double space means sentences contain a full blank line (the equivalent of the full height of a line of text) between the rows of words. By default, most programs have single spacing enabled, which is a slight space between each line of text, similar to how this paragraph looks. Most word processors and browsers allow for custom spacing.
Example of double spacing
Here is an example of how a sentence with double spacing might look.
Example of single spacing
Here is an example of how a sentence with single spacing might look.
2. DoubleSpace is a technology from Microsoft that compresses and uncompresses the data on a hard drive using FAT. By compressing the data contained on a hard drive more data can be stored on a hard drive. Today, with bigger hard drives and newer file systems DoubleSpace is no longer used.