A guitar is a popular musical instrument that makes sound by the playing of its (typically) six strings with the sound being projected either acoustically or through electrical amplification (for an acoustic guitar or an electric guitar, respectively)
One of the most common repairs to acoustic guitars is replacing damaged binding. Almost all acoustic guitars have some type of binding around the edges where the top and back meet the sides. Many acoustic guitars also have binding around the fretboard and peg head. Acoustic guitar binding can be made out of many different kinds of material including: various woods, plastic, or celluloid. A "true" binding around the body of the guitar is inlayed or glued in a channel cut from the body. A router is used to cut a small channel or shelf on the edges of the guitar for the binding to sit on. The binding is then bent and shaped to fit the body and glued in place. Most of the time decretory strips are usually inlayed next to the binding. Purfling strips are thin laminate pieces of wood dyed different colors.
Acoustic guitars have binding on the edges bound to create stronger joints between the top, sides, and back of the guitar. The binding acts almost as a brace around the outside of the guitar. It protects the fragile, grain edges of the top and back while helping attach them to the sides. Binding is important structurally and aesthetically.
The most common problem with acoustic guitar binding is loosening or cracking due to humidity or heat and rough handling. When your guitar is stored in low humidity, the wood will shrink as it dries. Since most binding on acoustic guitars is made out of celluloid or plastic, the binding shrinks at a different rate than the body and become detached from the body of the guitar
If the binding is cracked, it is important to repair it immediately. The loose binding can snag and cause further cracking the guitar finish in the process. Immediately tape the end of the loose binding with some plastic tape until you can get it repaired, the tape shouldn't hurt your finish if it's not on there for extended periods of time.