Samsung Galaxy Alpha

First generation-Samsung Galaxy A3 (2014), and Samsung Galaxy A5 (2014) The Samsung Galaxy Alpha was introduced on 13 August 2014 and released in September 2014. A high-end device, the Galaxy Alpha is Samsung's first smartphone to incorporate a metallic frame. Its operating system is based on Android 4.4.4 "KitKat" with its own version of TouchWiz UI. Several updates were made throughout the world and in April 2015, Android 5.0.2 "Lollipop" was made available through an OTA update. 

  Second generation – Samsung Galaxy A (2016 series) New features were introduced in the Galaxy A 2016 Series which includes metal and glass body, NFC which supports Samsung Pay, Samsung's Adaptive Fast charging feature and increased battery life. The Galaxy A (2016) series are very similar to the Galaxy S6, and the Galaxy Note 5 flagships, which were released in April 2015, and August 2015, respectively. 

  Third generation – Samsung Galaxy A (2017 series) In January 2017, Samsung unveiled the 2017 edition of the Galaxy A series. Newly improved features include 16-megapixel front and back cameras, an Exynos 7 Octa 7880 SoC, a 3D glass display (similar to Samsung Galaxy S6 edge+, Galaxy Note 5 and Galaxy S7), barometer and gyroscope sensors and IP68 certification for water and dust resistance as well as support for Gear 360 (2017). The new design of the series are very similar to the Galaxy S7 and the S7 Edge, released in March 2016. The series comprises three models: Galaxy A3, Galaxy A5, and Galaxy A7. 

  Fourth generation – Samsung Galaxy A (2018 series) The 2018 Galaxy A Series introduces many high-end features for the first time in the Galaxy A lineup, including multi-lens camera, Infinity Display, Adaptive Fast Charging, IP68 certification, and revamped design. This series uses Samsung Experience UI derived from the Galaxy S8 and Galaxy Note 9. The series comprises seven models: Galaxy A6, Galaxy A6+, Galaxy A7, Galaxy A8, Galaxy A8+, Galaxy A8 Star, and Galaxy A9. 

  Fifth generation – Samsung Galaxy A (2019 series) Samsung introduced the 2019 Galaxy A Series in February 2019, alongside the online-exclusive Galaxy M Series. Unlike all the previous models, the lineup shifts to the new two-digit nomenclature first introduced in the Galaxy S10. It retains the higher-end features previously introduced in the Galaxy A 2018 series with several improvements, alongside a "waterdrop" notch display (also debuted in the Galaxy M series), higher battery capacity, newer SoCs, and higher memory capacity. The video stabilization feature returned after it was removed from the Galaxy A 2017 series, but IP67 rating was removed on the higher models. This lineup, except the A2 Core, features One UI user interface, in accordance to the S10 series. The series comprises the most numerous models of the Galaxy A series, with eighteen models – Galaxy A2 Core, Galaxy A10e, Galaxy A10, Galaxy A10s, Galaxy A20, Galaxy A20s, Galaxy A30,Galaxy A30s, Galaxy A40, Galaxy A40s, Galaxy A50, Galaxy A50s, Galaxy A60, Galaxy A70, Galaxy A70s, Galaxy A80 and Galaxy A90.