Telegram X for Android was an alternative client to the main Telegram app. It was developed by Telegram[SQ]s team but focused on a different approach to design and features, often implementing newer technologies and sometimes experimenting with UI/UX elements before rolling them into the main Telegram app.

Key differences (past tense because it[SQ]s no longer available) :

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Faster performance:

It aimed to be faster and more responsive than the standard Telegram app, especially on lower-end devices.
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Different UI/UX:

It had a distinct visual style, often sleeker and more modern than the main app. This included animations and transitions that differed from the standard Telegram client.
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Experimental features:

New features or design changes would sometimes appear in Telegram X before making their way to the official app.
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Ultimately discontinued:

Telegram X was eventually retired by Telegram, with all of its functionalities and improvements integrated into the main Telegram app. Therefore, there[SQ]s no longer a separate Telegram X app available for download.