what is Windows Indexing & Disk Fragmentation?

Ask GEeks Explains:
what is Windows Indexing & Disk Fragmentation?

Indexing in windows is a option by which the user tells windows that whenever a file should be searched, certain areas as per the choice must be excluded. Indexing creates a master record in windows which allows faster searches to be conducted.
Disk fragmentation is usually caused by the allocation of dissimilar files in contiguous locations of the hard drive. It's not in control of the user absolutely. But defragmenting a disk arranges all files in order which is best readable for the computer.
defragment+indexing=improved disk perfprmnce

For all those who know a bit of c, c++ java etc

remeber the diff between declairing 10 variables and declairing an array of 10 variables??
axcessing members in array are faster then individual variables as they are stored next to each other ..
indexing means storing the address of files that is storing a pointer to each file in the index
if there are 100 file means 100 pointers(100 locations)
now just imagine you first defragment a disk
means 100 files into 10 arrays(10 location)and thn make indenxing of it ..
now only 10 pointers(addresses) will tell you where are the 100 files on the disk

defragment+indexing=improved disk perfprmnce