der Fußboden
floor
The lower, walkable surface of a room in a building.
Wir haben im Wohnzimmer einen neuen Fußboden aus Holz verlegt.
We installed a new wooden floor in the living room.

floor
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floor
The lower, walkable surface of a room in a building.
Wir haben im Wohnzimmer einen neuen Fußboden aus Holz verlegt.
We installed a new wooden floor in the living room.

The word is clearly composed of 'Fuß' (foot) and 'Boden' (ground/floor). The 's' in between is a linking sound that connects the two parts. Literally, it is the floor you stand on with your feet.
Pass auf, der Fußboden ist frisch gewischt und noch nass.
Be careful, the floor has just been mopped and is still wet.
The preposition 'auf' is used with the dative to describe a location (Where?). It is used with the accusative to indicate a direction (Where to?).
Die Spielsachen liegen auf dem Fußboden.
The toys are lying on the floor.
Common verbs in connection with 'Fußboden' (floor) are 'den Fußboden wischen' (to mop the floor), 'saugen' (to vacuum), or 'fegen' (to sweep). When a new floor is installed, you say 'einen Fußboden verlegen' (to lay/install a floor).
Am Wochenende müssen wir den Fußboden im Wohnzimmer wischen.
At the weekend, we have to mop the floor in the living room.
floor / ground
'der Boden' and 'der Fußboden' can both mean the surface you walk on. However, 'Fußboden' is used only in a room or building. 'Boden' is more general: indoors it can be the floor, but outdoors it can also be the ground. Learners may confuse the words because in an apartment you can often say both. If you want to clearly say that you mean the walkable surface in a room, 'Fußboden' is more precise.

Der Fußboden im Flur ist aus hellem Holz.
The floor in the hallway is made of light wood.
Nach dem Sturm lagen viele Blätter auf dem Boden.
After the storm, there were many leaves on the ground.