der Saal
hall
A large room in a public building used for events, concerts, celebrations, or meetings.
Die Hochzeitsfeier fand in einem festlich geschmückten Saal statt.
The wedding celebration took place in a festively decorated hall.

hall
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hall
A large room in a public building used for events, concerts, celebrations, or meetings.
Die Hochzeitsfeier fand in einem festlich geschmückten Saal statt.
The wedding celebration took place in a festively decorated hall.

The preposition 'in' is used with 'Saal' (hall/auditorium) with different cases depending on the situation. Movement into the room requires the accusative ('in den Saal' — into the hall), while a state or action inside the room requires the dative ('im Saal' — in the hall).
Die Gäste gingen langsam in den festlichen Saal.
The guests slowly went into the festive hall.
When 'Saal' (hall) refers to a general event room, it is often combined with verbs like 'mieten' (to rent), 'reservieren' (to reserve), or 'schmücken' (to decorate). Typical adjectives are 'festlich' (festive), 'groß' (large), or 'klein' (small).
Für die Konferenz haben wir den größten Saal im Hotel gemietet.
For the conference, we rented the largest hall in the hotel.
In the context of theater, cinema, or concerts, 'der Saal' (the auditorium) can also stand metonymically for the entire audience. In this case, the word describes the reaction of the people present.
Nach dem beeindruckenden Solo applaudierte der ganze Saal.
After the impressive solo, the whole auditorium applauded.
room / space
'der Raum' and 'der Saal' both refer to an area in a building. 'Raum' is the more general word and can be a small room, an office, or a classroom. 'Saal' usually means a large room, often for many people and for events, celebrations, concerts, or talks. In a theater or cinema, 'Saal' can also be the auditorium. The words can be confused because every 'Saal' is a 'Raum', but not every 'Raum' is a 'Saal'. If the size or the event is important, 'Saal' is more precise.

Der Saal war schon voll, als das Konzert begann.
The hall was already full when the concert began.
In diesem Raum lernen wir jeden Samstag Deutsch.
We learn German in this room every Saturday.