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By the time you've read this, I think you should have a pretty good idea of what a password manager is. However, for those unfamiliar with the subject, it's still worth explaining. Nowadays, when using various online services, more established platforms require you to register and create a strong password. Examples include Google, Weibo, Twitter, Instagram, and even gaming platforms. Over time, most people end up using the same username and password for everything. This leads to two problems: 1. Your username might have been taken by someone else on a particular platform; 2. If your username on a particular platform is compromised for unknown reasons, affecting all platforms, even a pianist would tire of changing it, let alone changing it individually.