What WhatsApp Ticks Really Mean (System Design Explained) | System Storm

One grey tick. Then two. Then blue. Here's what actually happens to your message in between. → Your phone locks the message first. Only your friend's phone has the key → It goes to WhatsApp's server, not straight to your friend. 1 grey tick = the server has it → Your friend's phone stays connected to the server, like a call that never hangs up, so the server sends it straight down → Their phone replies "received". 2 grey ticks = it's on their phone → Phone off? The server keeps it and delivers it the moment they're back online → They open the chat, their phone replies "read", and your ticks turn blue (if read receipts are on) 🌩️ System Storm: how everyday apps work, explained simply. Next: how UPI stops you paying twice. Instagram: @thecodestormdev #systemdesign #whatsapp #shorts