A stream is a continuous flow of data between two points. It can go one way (download a song) or both ways (a video call). In apps and on the web, streams move small chunks in order - like a line of tiny packets - so audio, video, or messages arrive smoothly.
Most things you do online are streams: music, games, chats, live classes. Knowing that data flows in real time helps you spot risks (leaky or fake connections) and fix issues (lag, stutter).
Setup: your device and a server agree on how to talk (protocols like TCP/UDP, often wrapped in TLS for encryption).
Flow: data is sent in sequence; the receiver reorders or retries missing pieces.
Control: apps adjust quality or speed based on network conditions.
Close: when done, both sides end the session to free resources.
The padlock is missing on a site that streams passwords or payments (no HTTPS).
“Mixed content” warnings (secure page loading insecure media).
Sudden spikes in data usage when you’re not streaming anything.
Unknown apps keeping long-lived connections in the background.
Prefer apps and sites that use HTTPS/TLS; avoid logging in on open Wi-Fi.
Close unused tabs/apps and disable background play where you don’t need it.
Check app permissions and data-saver settings; monitor your monthly usage.
Keep your OS, browser, and security tools updated to protect active streams.