Answer / vivek

A sparse file is a type of computer file that attempts to
use file system space more efficiently when the file itself
is mostly empty. This is achieved by not writing data to
disk when it has been allocated but not actually filled
with data. Instead, brief information about these empty
regions is stored, which takes up much less disk space.
These regions are only written to disk at their actual size
when data is written to them; the file system transparently
converts empty sections into blocks filled with zero bytes
when read at runtime. Most modern file systems support
sparse files, including most Unix variants and NTFS. Sparse
files are commonly used for disk images, database
snapshots, log files and in scientific applications.

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