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the Samsung Galaxy S9 and Samsung Galaxy S9+ shortened to S9 and S9+, respectively are Android smartphones produced by Samsung Electronics as part of the Samsung Galaxy S series. The devices were revealed at the Mobile World Congress in Barcelona on 25 February 2018, as the successors to the Samsung Galaxy S8 and S8+.

The Galaxy S9 and S9+ have nearly identical features to the S8 batch, with the same display size and aspect ratio, just like their predecessor. One highly regarded change to distinguish between the models is the location of the fingerprint sensor. While the S8's is found beside the camera, the S9's is directly underneath it. Most notably, however, the S9 line is equipped with several camera improvements over the S8.

The phone has received generally favorable reviews, with critics mostly noting the enhanced camera and better positioned fingerprint scanner. Critics, however, still criticize the lack of improvement to other features compared to its predecessor.

Hardware

On the front, the Galaxy S9 and S9+ look identical to the S8 and S8+. They both feature 1440p Super AMOLED displays, with an 18.5:9 aspect ratio. The S9 has a 5.8-inch panel, while the S9+ uses a larger 6.2-inch panel.

In most countries, the S9 and S9+ both come with a Samsung Exynos 9810 SoC. Versions sold in the United States, Canada, China, Hong Kong, Japan, and Latin America come with the Qualcomm Snapdragon 845 SoC instead.

The S9 comes with 4 GB of RAM; the S9+ comes with 6 GB of RAM. Both devices come with storage options of 64, 128 and 256 GB, and feature the ability to use a microSD card to expand the storage to a maximum of 400 GB.

The battery capacities are the same as their predecessors: 3000 mAh for the S9, and 3500 mAh for the S9+.[7]Just like its predecessor, the S9 supports AirFuel Inductive formerly PMA and Wireless Power Consortium's Qi wireless charging standards.

The S9 and S9+ now have stereo speakers tuned by AKG and the phones also have Dolby Atmos surround sound support; furthermore, the S9 and S9+ are two of the few smartphones that still retain the 3.5mm headphone jack.

Where the S9 and S9+ have the most noticeable change from the S8 line is on the back of the phone. The fingerprint sensor has been moved from the right of the camera to a more centralized location just below the camera like on the Galaxy A8 and A8+ for convenience. A more secure unlocking method has been added, where face recognition and iris scanning have been merged into one and called Intelligent Scan.

The cameras on both phones received improvements. The S9+ has a dual-lens camera setup on the back, like on the Galaxy Note 8, while the S9 only has a single camera on the back. Both phones have a Dual Aperture rear camera which can switch between f/1.5 and f/2.4, depending on lighting conditions.[10] The phones can shoot 4K at 60 frames per second (limited to 5 min), 1080p at 240 frames per second and 960 frames per second "Super Slo-Motion " video at 720p. AR Emoji, similar to Apple's Animoji feature on the iPhone X, is a new feature that lets the user make emojis based on themselves. Third party app support is provided for this feature.

There are also several construction improvements compared to S8 and S8+ models, mostly to increase physical durability, such as thicker glass, thicker metal rim and different (less prone to deformation) metal alloy used for the frame.

for more info vist https://www.samsung.com/global/galaxy/galaxy-s9/