Why is it important to use different passwords for each site?

Using different passwords for each site is crucial primarily to ensure that if one site becomes compromised, the security of your other accounts remains intact. Many people tend to reuse the same password across multiple platforms for convenience. However, this practice poses a significant risk: if a hacker gains access to one site and obtains your credentials, they can potentially access any other account where the same password is used.

By utilizing unique passwords for each account, you effectively contain the risk to the individual site that was compromised. Even if one account is breached, the other accounts remain protected, significantly reducing the potential impact of such a security issue.

The other choices do not address the fundamental reason for utilizing unique passwords. Increasing memory skills does not relate to the primary goal of password security. Saving time when logging in could actually be counterproductive since creating unique passwords often requires more time upfront. Lastly, making it easier to share passwords with friends contravenes the principles of good security practices, which emphasize maintaining the confidentiality of access credentials.