With the development of Bluetooth® technology, wireless earbuds have evolved into a very small size and cordless form factor that we call, "True Wireless Stereo (TWS)."
There are two types of TWS earphones:
1. In-ear Earphones:
In-ear earbuds have a silicone ear tip. That part goes into your ear canal. The ear tips of in-ear earbuds are bendable and flexible. In-ear earbuds go deeper into your ear than semi in-ear earbuds.
2. Semi In-ear Earphones:
The semi in-ear earbuds (also called half-in ear earphones) are already made in such a way that they fit in your ear. Semi In-ear earbuds lie in your ear close to your ear canal. They are therefore harder and they do not have an extra silicone attachment.