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You shot photos with a Sony Alpha camera and the files are .arw. This is Sony's proprietary RAW format — unprocessed sensor data straight from the camera, preserving the full dynamic range and colour information for professional editing in post-production.
ARW stores 12-bit or 14-bit data per colour channel (compared to JPG's 8-bit), which gives you dramatically more headroom for adjusting exposure, recovering highlights, pulling details from shadows, and fine-tuning white balance — changes that would destroy a JPG. Each .arw file is typically 20-40 MB depending on the sensor resolution. Sony updates the ARW format with each camera generation, so older software may not recognize files from newer cameras.
Adobe Lightroom (subscription) handles ARW from all Sony cameras. Capture One (subscription) is popular with Sony shooters and offers camera-specific profiles. Darktable (free, open-source) supports most ARW files. Sony's own Imaging Edge Desktop (free) handles all Sony RAW files. For sharing photos, export to JPG — ARW is for editing, not distribution.