Jessie is an energetic and excited cowgirl toy first introduced in Toy Story 2. Jessie was the favorite toy of Emily and the two shared a bond for many years, however as Emily grew she started losing interest in Jessie. Jessie was forgotten about for many years until she was sold. She quickly made friends with Stinky Pete and eventually Woody. Once she joined Woody to be apart of Andy's toys she started a romance with a certain Space Ranger.
NOTE: Yes, Mary Kay Bergman does do Jessie's yodels in Toy Story 2 but because she doesn't get real dialog she is excluded from the compare.