Fortnite Mobile is the (obviously) mobile version of the mega hit game Fortnite.

The game features 3 distinct game modes: Battle Royale, Save the World and Creative.

Save the World is available on PC, PlayStation and Xbox.

Battle Royale and Creative are also available on Nintendo Switch and mobile devices, NOT on the official app stores, but using ‘GeForce NOW’ or ‘Xbox Cloud Gaming’.

The Battle Royale mode is the same as other classics in genre like PUBG, Free Fire, CODM and others.

A 100 players skydive into an arena (Island) with no or minimal gear or weapons.

Items are scattered randomly throughout the map and over time the map shrinks, forcing remaining players into a smaller and smaller area.

Anyone caught outside of the circular safe zone are getting killed.
The last player or squad alive is declared the winner.

The main distinction of Fortnite from other titles in the genre is the building system.

Almost all of the objects around the map can be harvested for different materials (wood, stone, and metal), which can then be used to build fortifications like walls, ramps, floors, and roofs.

Builds are used to better traverse the map, protect from other players gunfire or to slow down other players.

Athena
Apollo
Artemis
Asteria

Dusty Divot, Fatal Fields, Flush Factory
Greasy Grove, Haunted Hills, Junk Junction, Lazy Links, Lonely Lodge,
Loot Lake, Lucky Landing, Paradise Palms, Pleasant Park, Retail Row,
Risky Reels, Salty Springs, Shifty Shafts,
Snobby Shores, Tilted Towers, Tomato Temple, Wailing Woods.

factions, groups & companies that can be found in Fortnite: Battle Royale and Fortnite: Save the World‘s Lore and background story:

Imagined Order, The Seven, The Resistance, The Last Reality, Oathbound, Spire Cult, Eclipse,
War Effort, GHOST, SHADOW,
Cold Blooded, Most Wanted,
Peace Syndicate, Fox Clan, River Guard,
The Luminaries, The Explorers, The High Stakes Club, The Unseen,
The Ice Kingdom, The Fire Kingdom,
Scallywags, Expedition, The Government, Atlantis, No Sweat, Insurance, Reality Warriors, The Ancients, Homebase, Vindertech,
First Order, Galactic Empire,
Stark Industries, S.H.I.E.L.D., Lex Corp.