Renamer is a powerful and versatile file and folder renaming tool. It[SQ]s not a single, specific program, but rather a *type* of software. Many different programs exist with the name "Renamer" or similar, and they all share the common goal of letting users batch rename files and folders quickly and efficiently, using various methods.

These tools typically offer features such as :

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Batch renaming:

Rename multiple files or folders at once, avoiding tedious manual renaming.
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Regular expressions:

Use powerful regular expressions for complex renaming tasks.
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Numbering sequences:

Automatically add sequential numbers to filenames.
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Date/time stamps:

Insert date and time information into filenames.
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Case conversion:

Change the case of filenames (uppercase, lowercase, title case).
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Character replacement:

Replace specific characters in filenames.
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Prefix/suffix addition:

Add prefixes or suffixes to filenames.
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Removal of characters:

Delete specific characters from filenames.
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Preview functionality:

See the renaming results before applying changes, preventing accidental data loss.
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Undo functionality:

Revert renaming actions if necessary.

Essentially, any software that provides these capabilities for batch renaming files and folders can be considered a "Renamer" application. To understand what a specific "Renamer" does, you[SQ]d need to specify which program you[SQ]re referring to (e.g., "Bulk Rename Utility," "Advanced Renamer," etc.).