End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
https://123dok.co/document/zgw64go2-강좌-소개-강좌-소개-멀티미디어의-이해-멀티미디어의-이해.html