Short answer
A travel eSIM is a digital SIM that gives you mobile data without using a physical SIM card.
You install it on a compatible, unlocked phone and use it to connect to local mobile networks while traveling.
What you can do
Use mobile data abroad.
Keep your regular SIM for calls and SMS if your phone supports dual SIM.
Use apps like WhatsApp, Telegram, FaceTime, Maps, email, and browsers.
What to know
This eSIM is data-only.
It does not include a regular phone number, SMS line, or standard voice-call line.
Your device must support eSIM and be unlocked.