The Samsung Galaxy S7, S8, and S9 are three flagship phones released in different years, and there are the following key differences between them:
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1. Exterior design: The S7 uses a combination of metal and glass design, while the S8 and S9 have a full-screen design that does away with physical buttons and moves the fingerprint sensor to the back.
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2. Display: The S7 is equipped with a 5.1-inch Quad HD Super AMOLED display, while the S8 and S9 have been upgraded to the 5.8-inch and 5.8\/6.2-inch Infinity Display, respectively, and the resolution has been improved.
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3. Processor and performance: Processor performance improves with each year. The S7 is powered by an Exynos 8890 or Snapdragon 820 processor, while the S8 is powered by an Exynos 8895 or Snapdragon 835 processor and the S9 is powered by an Exynos 9810 or Snapdragon 845 processor. These upgrades bring faster speeds and better multitasking capabilities.
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4. Camera function: The camera is one of the focuses of each generation of mobile phone upgrade. The S7 is equipped with a 12-megapixel main camera and a 5-megapixel front-facing camera, while the S8 and S9 are upgraded to 12-megapixel and 8-megapixel main cameras, respectively, and introduce more shooting modes and features such as slow motion video, super slow motion, zoom, and more.
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5. Other features: The S8 and S9 introduce an iris scanner and facial recognition, making it easier to unlock the phone. In addition, the S9 also introduces variable aperture technology, which can automatically adjust the aperture size according to the ambient light.
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It is important to note that these differences are general comparisons in hardware specifications and do not include functional improvements brought about by software and system updates. Each new generation of mobile phones brings some new features and optimizations, so when choosing a purchase, you can make a decision based on your needs and budget.