This breakout is for a fascinating chip - it looks like an SPI Flash storage chip (like the GD25Q16) but its really an SD card, in an SMT chip format.
Overview, Adafruit SPI Flash SD Card
SPI Flash SD Card - XTSD 512 MB Adafruit 4899 : Electronics
New Part Day: SD NAND Are Surface Mount Chips That Work Like An SD Card
Adafruit SPI Flash SD Card - XTSD 512 MB : ID 4899 : $9.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Adafruit SPI Flash SD Card - XTSD 512 MB
Adafruit Micro SD SPI or SDIO Card Breakout Board - 3V ONLY! - Elmwood Electronics
Adafruit SPI Flash SD Card - XTSD 512 MB
512MB flash card that looks like SD to ESP32 - Support - Pimoroni Buccaneers
Overview, Adafruit SPI Flash SD Card
SPI Flash SD Card - XTSD 512 MB Adafruit 4899: Buy Online at Low Prices in India
Overview, Adafruit SPI Flash SD Card
Adafruit SPI Flash SD Card - XTSD 512 MB : ID 4899 : $9.50 : Adafruit Industries, Unique & fun DIY electronics and kits