How it works
A second factor adds a check beyond the password. Sharing a code or approving an unexpected request can help someone else sign in.
What to check and do
- Enable additional verification where the service offers it.
- Read what the code approves; confirm only an action you initiated.
- Do not tell callers your codes or send them in chat.
Learning scenario
Learning example: a sign-in approval arrives while you are only reading news.
Self-check
Your answer stays on this page until it is closed or reloaded. No real passwords, codes or documents are needed. The result is not a security certificate.
Important limits
SMS or biometrics do not guarantee the safety of the whole transaction. Available methods depend on the service.
Primary sources
Learning materials can reduce mistakes but do not guarantee protection from every threat. Not investment advice.