In C, a string is simply an array of characters terminated with a null character (`\0`). This null character marks the end of the string and is used to indicate to C where the string ends.

A character array is a fixed-size array that can hold a sequence of characters. It is often used to represent a string in C. Character arrays are declared as follows:

```c
char myCharArray[100]; // declares an array that can hold 100 characters
```

To initialize a character array with a string, you can use double quotes:

```c
char myString[] = "Hello, world!";
```

In this example, the compiler automatically adds the null character at the end of the string.

To access individual characters in a character array, you can use array indexing:

```c
char myString[] = "Hello, world!";
char firstCharacter = myString[0]; // 'H'
char secondCharacter = myString[1]; // 'e'
```

You can also use string manipulation functions like `strcpy` and `strcat` to manipulate strings in C. Here's an example of using `strcpy` to copy a string from one character array to another:

```c
char sourceString[] = "Hello, world!";
char destString[100];

strcpy(destString, sourceString); // copies sourceString to destString
```

Note that when working with character arrays and strings in C, you need to be careful about buffer overflows and null-termination. Make sure that your character arrays are large enough to hold the strings you want to store, and always remember to include the null character at the end of your strings.

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