Short answers, pulled from the story.
The Nintendo Switch was released on the 3rd of March 2017, in Japan, most English-speaking and Western markets, and the United Arab Emirates. Its suggested retail price at launch was $299.99 in the United States.
Over 155 million Nintendo Switch units have been shipped worldwide, making it the second-best-selling console in history, behind only the PlayStation 2. It is also the best-selling Nintendo console ever made.
The Nintendo Switch uses an Nvidia Tegra X1 system-on-chip with a quad-core ARM Cortex-A57 CPU manufactured on a 20-nanometer process. A 2019 hardware revision switched to the more efficient Tegra X1+, extending battery life to between 4.5 and 9 hours.
The Nintendo Switch supports three gameplay modes: TV mode, where the console is docked and outputs to a television; Tabletop mode, where a built-in kickstand holds the screen upright for shared play on a flat surface; and Handheld mode, where the console is used as a portable device with Joy-Con attached.
The Nintendo Switch Lite is a handheld-only revision released on the 20th of September 2019, with a suggested retail price below that of the original model. It integrates the Joy-Con hardware directly into the unit, uses a smaller 5.5-inch screen, includes a traditional directional pad instead of four separate buttons, and does not support docking to a television.
Before the 4.0 system update, the Nintendo Switch firmware contained a playable version of the NES game Golf, programmed by former Nintendo president Satoru Iwata. It could only be accessed by setting the system clock to July 11, the date of Iwata's death in 2015, and moving the Joy-Con in the same gestures Iwata used in Nintendo Direct presentations. The executable code appears to have been removed in the 4.0 update.