die Saison
season
A specific period of the year during which an activity takes place, especially in sports, tourism, or culture.
Die Mannschaft hat in der letzten Saison die Meisterschaft gewonnen.
The team won the championship last season.

season
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season
A specific period of the year during which an activity takes place, especially in sports, tourism, or culture.
Die Mannschaft hat in der letzten Saison die Meisterschaft gewonnen.
The team won the championship last season.

In tourism and sports, 'Saison' (season) is often combined with 'Haupt-' or 'Neben-' as in 'Hauptsaison' (high season) and 'Nebensaison' (low season/off-season). Common verbs are 'die Saison eröffnen' (to open the season) or 'die Saison beenden' (to end the season).
In der Hauptsaison sind die Hotels oft doppelt so teuer.
In high season, the hotels are often twice as expensive.
To express that a particular fruit or vegetable is currently ripe and being sold, you use the fixed expression 'Saison haben' (to be in season). The subject is the type of fruit or vegetable.
Spargel hat nur im Frühling Saison.
Asparagus is only in season in spring.
The important adjective 'saisonal' (seasonal) is derived from 'die Saison' (the season). It means 'belonging to a particular season' or 'caused by the time of year'.
Wir bieten vor allem saisonales Gemüse aus der Region an.
We mainly offer seasonal vegetables from the region.
season / relay / squadron
'die Saison' and 'die Staffel' are easily confused because the English word 'season' can touch on both ideas. In German, 'Saison' is a period of the year when something takes place, for example in sports, tourism, or culture. 'Staffel' is used for TV series to mean a complete set of episodes. So for a football team you say 'Saison', and for a series you say 'Staffel'. If you are talking about Netflix or a television series, 'Staffel' is almost always the right word.

Die neue Saison beginnt im August mit einem Auswärtsspiel.
The new season starts in August with an away game.
Am Wochenende schauen wir die letzte Staffel unserer Lieblingsserie.
At the weekend, we are watching the final season of our favorite series.