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What is two-factor authentication (2FA) and why use it
2FA adds a second layer of protection beyond the password. We explain how it works and why it significantly reduces the risk of account break-ins.
A password alone, however strong and complicated, is still the weak link in the security chain — passwords are stolen via phishing attacks, guessed by automated tools, or most commonly, leaked from completely different services (the hacked database of some unrelated site) that people reuse in multiple places. 2FA (two-factor authentication) adds a second, independent proof of identity beyond the password itself.
How 2FA concretely works
After you enter the password correctly, the system also asks for a second, one-time code generated or sent through another, separate channel — most often an SMS message, or a dedicated authenticator app on the phone generating a new code every thirty seconds.
Without this second code, the correct password alone is not enough for someone to enter the account — even if the attacker knows the password, they don't have access to your physical phone to get the second, required code.
Why this matters especially for business systems
Even if someone learns your password (through a data leak from another site, a phishing email, or any other way), without access to the second factor they simply cannot enter the account.
For admin accounts and access to business systems containing sensitive company or client data, 2FA is today a standard of security practice, not an optional add-on to "maybe introduce one day" — serious systems include it as a mandatory part from day one.
Nikola Cerić
Founder & CEO, Manage IT
More than 10 years of software development experience — in his own company and in major IT companies across the Balkans.