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The function that converts a string entirely to lower case is the Lower function. This function takes a text input and transforms all uppercase letters in the string to their corresponding lowercase letters, ensuring uniformity in case and making it especially useful for standardizing text data.

For example, if you have a string like "Hello World," applying the Lower function would result in "hello world." This can be particularly useful in scenarios where case sensitivity could lead to errors or inconsistencies in data analysis, such as when comparing strings or aggregating textual data.

The other options listed do not serve the purpose of converting strings to lower case. The Capitalize function, for instance, would typically convert only the first letter of each word to uppercase. The Replace function is used to replace specified characters or substrings within a string without altering the case. The Mid function is designed to extract a specified number of characters from a string starting at a defined position and also does not handle case conversion. Therefore, the Lower function is the appropriate choice for converting a string entirely to lower case.