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.
http://fara.farafile.ir/file/24154/خلاصه-کتاب-مبانی-رایانه-فنی-و-حرفه-ای-(رشته-کامپیوتر)