Mastiff37 :
ak47jar3d :
http://windows.microsoft.com/en-us/windows-10/getstarted-search-for-anything-cortana
That just searches the web as far as I can tell.
1) No, it does BOTH.
2) I actually DISABLED web search from the Start Menu for now.
*My advice is to launch Windows Explorer:
1) Start Menu-> "File Explorer"
2) type what you want to find in the upper-right search bar
(Note when you search this way you search whatever FOLDER is displayed. For example, if you open Windows Explorer/File Explorer then on the left click "C:" drive note at the top it shows "This PC:\ Local Disc C:\" so you'll be searching the entire C: partition.
If you know your files are in "Documents" then it's better to search that directly)
*There will be folder shortcuts from the Start Menu for frequently used folders and pinned folders. Simply click the ARROW on the right of "File Explorer" rather than opening it directly.
For example, click SM-> File Explorer (right arrow)-> Documents
Update:
I think Indexing is turned on by default though note it can cause problems for some people such as a memory leak and high CPU usage. If that happens to you then investigate turning Indexing off. Indexing simply makes searching faster as it scans your local drives (or at least the folders you've allowed in Search options).