HTC Sync was a software application developed by HTC for Windows computers. Its purpose was to connect HTC smartphones to a PC to facilitate :

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Data synchronization:

Transferring contacts, calendars, messages, and other data between the phone and the computer.
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Software updates:

Downloading and installing the latest software updates for the HTC phone.
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File management:

Copying files (like photos, videos, and music) between the phone and the computer.
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Backup and restore:

Creating backups of the phone[SQ]s data and restoring from those backups.

Essentially, it acted as a bridge between your HTC phone and your Windows PC, allowing for easy management of your phone[SQ]s content.

However, HTC Sync is no longer actively supported or updated by HTC.

This means it[SQ]s likely to be incompatible with newer Windows operating systems and more modern HTC phones. HTC has moved away from providing dedicated sync software, encouraging users to utilize cloud services and built-in Windows features for data management.