der Club
club
An association or organization where people with shared interests meet, such as a sports club or a book club.
Er ist seit vielen Jahren Mitglied im örtlichen Tennis-Club.
He has been a member of the local tennis club for many years.

club
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club
An association or organization where people with shared interests meet, such as a sports club or a book club.
Er ist seit vielen Jahren Mitglied im örtlichen Tennis-Club.
He has been a member of the local tennis club for many years.

The word 'Club' (club) has two main meanings. The context makes clear which one is meant: if it is about sports, books, or hobbies, it means an association. If it is about dancing, music, and going out in the evening, it means a nightclub.
Ich treffe mich heute Abend mit meinem Buchclub.
I'm meeting with my book club this evening.
When talking about an association, people say that they are 'Mitglied in einem Club' (a member of a club) or 'einem Club beitreten' (to join a club). These verbs are not used for a nightclub.
Um dem Golf-Club beizutreten, muss man einen hohen Jahresbeitrag zahlen.
To join the golf club, you have to pay a high annual fee.
When a nightclub is meant, the verb 'gehen' (to go) is usually used in the combination 'in den Club gehen' (to go to the club). This describes the activity of going out to dance.
Meine Freunde und ich gehen am Wochenende oft in einen Club.
My friends and I often go to a club on the weekend.
club / association
'der Verein' and 'der Club' can both refer to a group of people with shared interests. In German, 'Verein' often sounds more official and is frequently a fixed organization with members, rules, and perhaps a board, for example a sports club. 'Club' can also be this kind of group, but it often sounds more informal or modern, for example a 'Buchclub' (book club). In addition, 'Club' can also mean a nightclub where people dance. That is why the words can be confused. When referring to an official membership organization, 'Verein' is usually more precise. When referring to an informal group or a nightclub, 'Club' is more likely to fit.

Am Freitag trifft sich der Buchclub wieder in der Bibliothek.
On Friday, the book club is meeting again at the library.
Nach dem Umzug ist Lena in einen Sportverein eingetreten.
After moving, Lena joined a sports club.