What is password?

What is password?

Password is a key of enter an access any security system or controls room. 
I find from Wikipedia: A password is a word or string of characters used for user authentication to prove identity or access approval to gain access to a resource (example: an access code is a type of password), which should be kept secret from those not allowed access.

Example a strong password: 55484%@$Ksmp ( here all type of word, symbol, count so it’s a strong password)
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Why we need pass-word?
1.    Enter any system
2.    Enter our won security system
3.    Control our account
4.    Protect our money, information, data & many more.