der Kader
squad
The full group of players on a sports team who are available for competitions.
Der Trainer hat den Kader für das nächste Länderspiel bekannt gegeben.
The coach announced the squad for the next international match.

squad / cadre
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squad
The full group of players on a sports team who are available for competitions.
Der Trainer hat den Kader für das nächste Länderspiel bekannt gegeben.
The coach announced the squad for the next international match.

You can recognize the meaning of 'Kader' from context. In a sports context (players, coach), it refers to the squad. In a business context (company, management), it refers to executives. In a political context (party, military), it refers to a core group of officials.
Der Trainer nominierte 23 Spieler in den Kader für die Weltmeisterschaft.
The coach nominated 23 players for the World Cup squad.
In the sports context, the most common use, there are fixed expressions. A player can 'im Kader stehen' (be in the squad), 'in den Kader berufen werden' (be called up to the squad), or 'aus dem Kader gestrichen werden' (be dropped from the squad).
Der junge Stürmer wurde überraschend in den Nationalkader berufen.
The young striker was surprisingly called up to the national squad.
The meaning 'political core group' is historically strongly associated with socialist states and parties, for example in the former GDR. In this context, it describes a group of loyal, trained officials.
Die Partei verließ sich auf ihre treuen Kader im ganzen Land.
The party relied on its loyal cadres throughout the country.
team
'das Team' and 'der Kader' can both refer to a group of people who belong to a task or organization. 'Team' is the normal word when people work together or play together. 'Kader' is used especially in sports for all the players who are available for matches, even if they do not all play at the same time. In companies, 'Kader' can also mean management. The words can be confused in sports: the team plays or works together, while 'der Kader' is more the full selection of possible players.

Der Trainer hat zwei junge Spieler in den Kader aufgenommen.
The coach added two young players to the squad.
Unser Team bereitet die Präsentation gemeinsam vor.
Our team is preparing the presentation together.