der Freiwillige
volunteer
A male person who takes on a task, service, or job of his own accord and usually without payment.
Als Freiwilliger hilft er jedes Wochenende im Tierheim.
As a volunteer, he helps at the animal shelter every weekend.

volunteer
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volunteer
A male person who takes on a task, service, or job of his own accord and usually without payment.
Als Freiwilliger hilft er jedes Wochenende im Tierheim.
As a volunteer, he helps at the animal shelter every weekend.

The word is composed of 'frei' (free) and 'Wille' (will). A 'Freiwilliger' (volunteer) is therefore a person who acts of their own free will, without being forced to do so.
Er arbeitet als Freiwilliger, weil er der Gemeinschaft helfen möchte.
He works as a volunteer because he wants to help the community.
'Freiwillige' (volunteer) is a nominalized adjective and is declined like an adjective. Pay attention to the endings, which change depending on the article and case.
Ein Freiwilliger meldete sich für die Aufgabe.
A volunteer came forward for the task.
The word is often used with prepositions to describe the area of activity. Typical formulations are 'Freiwilliger bei' (volunteer with/at an organization) or 'Freiwilliger in' (volunteer in a place or field).
Mein Bruder ist Freiwilliger bei der Feuerwehr.
My brother is a volunteer with the fire department.
employee
'der Angestellte' and 'der Freiwillige' can both be people who take on a task. The important difference is the type of work. An 'Angestellter' has an employment relationship and receives a salary. A 'Freiwilliger' helps of his own accord and usually without payment. The words can be confused because both can work in organizations, associations, or projects. When it is about paid work in a company, 'Angestellter' fits. When someone helps voluntarily, 'Freiwilliger' fits.

Am Samstag half ein Freiwilliger im Tierheim mit.
On Saturday, a volunteer helped out at the animal shelter.
Bei der Arbeit erklärt der Angestellte den neuen Kunden das Formular.
At work, the employee explains the form to the new customers.