"Downloader" is a general term for any software or tool used to download files from the internet. There[SQ]s no single "Downloader" program; it[SQ]s a category encompassing many different applications with varying features and capabilities. These can range from simple browser download managers (built into most web browsers) to sophisticated tools with features like :

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Download acceleration:

Splitting files into parts and downloading them concurrently to speed up the process.
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Resume capability:

Allowing you to restart downloads interrupted by connection issues.
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Download scheduling:

Setting downloads to occur at specific times.
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Download management:

Organizing and prioritizing multiple downloads.
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Support for various protocols:

Handling different file transfer protocols (HTTP, FTP, BitTorrent, etc.).

Examples of downloader software include:

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Browser[SQ]s built-in download manager:

Chrome, Firefox, Edge, etc., all have their own built-in downloaders.
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Internet Download Manager (IDM):

A popular third-party download manager known for its speed and features.
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JDownloader:

An open-source download manager.
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aria2:

A lightweight and versatile command-line downloader.
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Download Thunder:

A popular downloader in certain regions.

In short, "downloader" is a descriptive term for the function, not the name of a specific program.