What is Metadata?
Metadata is data about data. It is not what you say, but who you say it to, when, and from where. Think of a sealed letter. Metadata is everything written on the envelope.
What you actually wrote inside the envelope.
The address, return address, postmark date, and weight.
Even if nobody reads your letter, the envelope tells them who you wrote to, where you are, and when you sent it. Metadata tells the same story about digital messages.
The words in your messages.
Who you messaged, when, how often, for how long.
A former NSA director once said: "We kill people based on metadata." Knowing who talks to whom is often more valuable than knowing what they say.
You called your doctor for 30 minutes.
You might be sick. Insurance companies want to know.
Without hearing a word, they know you have health concerns. Combine this with other calls and they build a complete picture of your life.
Your phone connected to a clinic's WiFi.
You visited that specific medical facility.
Your device constantly broadcasts where you are. This creates a map of your movements that can reveal sensitive information.
The bottom line: Metadata is extremely revealing. Protecting your privacy means protecting your metadata, not just your messages.