What is a characteristic of blunt ends produced by endonucleases?

Blunt ends produced by endonucleases are characterized by a straight cut across the DNA strands, resulting in fragments that have no overhanging nucleotides on either side. This lack of overhang means that the ends are uniform and can be joined directly with another blunt end without the need for complementary sticky ends. The ability to ligate blunt ends is generally successful, although the efficiency can be lower compared to ligating sticky ends, which have overhangs that allow for more favorable interactions. Thus, the straightforward nature of the cut at the ends defines this characteristic accurately.