What is the difference between sticky ends and blunt ends in DNA cloning?

Sticky ends (cohesive ends) are created by restriction enzymes that cut DNA strands at different positions, leaving short single-stranded overhangs. These overhangs can base-pair with complementary sequences, facilitating efficient directional ligation. Examples include EcoRI and BamHI. Blunt ends are created when both strands are cut at the same position, leaving no overhangs. Blunt-end ligation is less efficient and non-directional but allows joining any blunt-ended fragments. Examples of blunt cutters include SmaI and EcoRV. Sticky ends are preferred for cloning due to higher ligation efficiency.