Master links are the key to a good chain's success. Using open chain instead of pre-cut-to-length chain offers the ability to save money. In addition, adjusting a chain to a determined link count allows precise chain lengths.
"Cutting" a chain is really a misnomer as nothing is really cut. Special tools allow you to push the connecting pins in and out. The master link secures it snugly together. It is an easy DIY repair to get the very length chain you need with open loop chain and a right-sized master link.