Easy to learn : jQuery is easy to learn because it supports same JavaScript style coding.
Write less do more : jQuery provides a rich set of features that increase developers' productivity by writing less and readable code.
Excellent API Documentation : jQuery provides excellent online API documentation.
Cross-browser support : jQuery provides excellent cross-browser support without writing extra code.
Unobtrusive : jQuery is unobtrusive which allows separation of concerns by separating html and jQuery code.