What hitch or bend is used to tie two ropes together?

Answer 1

Depending on how permanently the lines are to be joined, several bends will work. The Sheet Bend or Becket is good for temporary connections. For a fast disconnect, a Slippery Sheet Bend is made by slipping a bight of line through to finish the knot instead of the end of the line. Then a pull on the end will open the knot. For a more secure bend the Double Becket will work well. For even more security and a knot that will untie even after severe loading, use two Bowline knots with the loops through each other.