It just depends on what the foundation offering the money chooses to call it. To be a Rhodes Scholar or Fulbright Fellow, for example, indicates that you have been selected for financial support because of the high caliber of your demonstrated academic and co-curricular achievements. Nearly everyone will find at least one and probably several awards for which they are eligible and in which they are interested. There are awards available for most every major, but some will specify preferences or exclusions, so check carefully. There are awards available for most career objectives, too.
Some awards do specify preferred or exclusive career objectives, so again look carefully.
That depends upon the scholarship. For some, these items are fairly unimportant. For others, they can play a major role. Once you've decided which awards would further your goals and which you might be eligible for, visit the website for that scholarship and read further. Most all applications are now available for downloading and printing your own copy.