After splicing DNA, sometimes the resulting DNA strands become what's called "sticky ends", what are those? After splicing DNA, sometimes the resulting DNA strands become what's called "blunt ends", what are those? Which are preferred?

Sticky ends are short single stranded overhangs that can be easily rejoined (annealed) back to other strands of DNA with the same genetic base pairing. Blunt ends are when no single stranded overhangs, making segments difficult to anneal Sticky ends are preferred