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I noticed microSD cards have classes. What does it mean?

Speed Class - SD Association

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Secure Digital — Википедия

Secure Digital Memory Card (SD) — формат карт памяти (флеш-память), разработанный SD Association (SDA) для использования в портативных устройствах.

microSD Card Buying Guide - TechSpot

What do the A1 and A2 Ratings on SD and microSD Cards Mean?

SD card - Wikipedia

Secure Digital, officially abbreviated as SD, is a proprietary non-volatile memory card format developed by the SD Card Association (SDA) for use in portable devices.