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    <p>Mutable and immutable are English words meaning "can change" and "cannot change" respectively. The meaning of the words is the same in the IT context; i.e.</p> <ul> <li>a mutable string can be changed, and</li> <li>an immutable string cannot be changed.</li> </ul> <p>The meanings of these words are the same in C# / .NET as in other programming languages / environments, though (obviously) the names of the types may differ, as may other details.</p> <hr> <p>For the record:</p> <ul> <li><code>String</code> is the standard C# / .Net immutable string type </li> <li><code>StringBuilder</code> is the standard C# / .Net mutable string type </li> </ul> <p>To "effect a change" on a string represented as a C# <code>String</code>, you actually create a new <code>String</code> object. The original <code>String</code> is not changed ... because it is unchangeable.</p> <p>In most cases it is better to use <code>String</code> because it is easier reason about them; e.g. you don't need to consider the possibility that some other thread might "change my string". However, when you need to construct or modify a string using a sequence of operations, it may be more efficient to use a <code>StringBuilder</code>.</p> <hr> <p>And finally, for those people who assert that a <code>StringBuilder</code> is not a string because it is not immutable, the Microsoft <a href="https://msdn.microsoft.com/en-us/library/system.text.stringbuilder(v=vs.110).aspx" rel="noreferrer">documentation</a> describes <code>StringBuilder</code> thus:</p> <blockquote> <p>"Represents a <em>mutable string</em> of characters. This class cannot be inherited."</p> </blockquote>
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    1. POWhat is the difference between a mutable and immutable string in C#?
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    1. COVery short and clear answer. +1
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    2. CO@FlorinBombeanu - I'm explaining what the terms "mutable" and "immutable" mean ... which is what the Question asks about. I'm not talking about the specific .NET types used to represent mutable or immutable strings.
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    3. CO@StephenC - Yeah, I'm not challenging the term explanation. It's just that someone might get the idea that there is such a thing as "mutable string" in .NET just by looking at your answer. Also, the question clearly refers to C# string thus .NET's String type.
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