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A string in programming is a collection of characters, either as a variable or a literal constant. The concept of string may seem easy, but performing operations on any String can be a bit tricky. In almost all programming languages, strings can be changed and hence are considered mutable. Strings are also used by many websites to store user credentials like passwords, usernames, and content on the website. A string is simply a sequence of characters that include numbers, letters, and symbols.