Types of bonds for hair extensions.
The bond is the part of the hair extensions that is attached to your natural hair.
There are many different types: keratin bonds, tapes (tape-in extensions), nano rings (nanoring extensions), clips (clip-in extensions), etc. ...
Some are only suitable for permanent wear of the extensions, others are only temporary and must/can be removed every evening. The bonds connect your hair to the extensions, so you should make sure that they are made of high-quality materials.