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://123deta.com/document/zln33doq-序章コンピュタを使用する上で必要となる基本ソフトウェアオペレティングシステムの役割と使い方を紹介しま.html