die Zugabe
encore
An additional piece that an artist performs at the end of a concert or show in response to the audience's applause.
Die Band kam für zwei Zugaben zurück auf die Bühne.
The band came back on stage for two encores.

encore / freebie / addition
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encore
An additional piece that an artist performs at the end of a concert or show in response to the audience's applause.
Die Band kam für zwei Zugaben zurück auf die Bühne.
The band came back on stage for two encores.

The word is made up of 'zu' (to/in addition) and 'Gabe' (gift). A 'Gabe' is something that you give. A 'Zugabe' is therefore literally something that you 'give in addition'—whether an extra song, a free product, or another ingredient.
Als Zugabe spielte der Pianist noch ein Stück von Chopin.
As an encore, the pianist played one more piece by Chopin.
The context reveals the meaning: in connection with a concert or applause, it means an additional song. When shopping, it is a free extra. In cooking or chemistry, it means the addition of an ingredient.
Das Publikum klatschte so lange, bis die Band eine Zugabe gab.
The audience clapped until the band gave an encore.
In a concert context, 'Zugabe' (encore) is often used with the verbs 'geben' (to give), 'spielen' (to play), or 'fordern' (to demand/call for).
Die Fans forderten lautstark eine Zugabe.
The fans loudly called for an encore.
When it is about adding an ingredient, the structure 'die Zugabe von + [substance]' (the addition of + [substance]) is often used.
Die Zugabe von etwas Salz verstärkt den Geschmack.
The addition of a little salt enhances the flavor.
bonus
'der Bonus' and 'die Zugabe' both mean something additional. The difference lies in the typical context. 'Bonus' is often used for an additional payment, a benefit, or a plus point, for example at work or when shopping. 'Zugabe' is more about something that you get in addition: added for free with a purchase, or another song at the end of a concert. The words can be confused because both are something 'extra'. However, 'Bonus' sounds more general and often more formal, while 'Zugabe' is more concrete.

Nach dem Konzert rief das Publikum so lange, bis die Band eine Zugabe spielte.
After the concert, the audience kept calling out until the band played an encore.
Für gute Arbeit bekommt das Team dieses Jahr einen Bonus.
For good work, the team is getting a bonus this year.