
der Wechsel
change / switch
A change in which something is replaced by something else.
Ein Wechsel des Stromanbieters kann viel Geld sparen.
Switching electricity providers can save a lot of money.
change / switch
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change / switch
A change in which something is replaced by something else.
Ein Wechsel des Stromanbieters kann viel Geld sparen.
Switching electricity providers can save a lot of money.

substitution
The substitution of a player in a sport.
Der Trainer plante den Wechsel des Stürmers in der zweiten Halbzeit.
The coach planned the substitution of the striker in the second half.

currency exchange
The exchange of money into another currency.
Für den Wechsel von Euro in Pfund wird eine Gebühr erhoben.
A fee is charged for the exchange of euros into pounds.

bill of exchange
An outdated financial instrument that is a written, unconditional instruction to pay a specific sum of money at a specified time.
Im 19. Jahrhundert war die Bezahlung per Wechsel im Handel weit verbreitet.
In the 19th century, payment by bill of exchange was widespread in trade.
'Der Wechsel' (change/switch) is the noun form of the verb 'wechseln' (to change/switch). It always describes the exchange from one thing, state, or place to another.
Nach dem Studium stand ein Wechsel des Wohnortes an.
After university, a change of residence was coming up.
To describe the direction of the change, the structure 'der Wechsel von … zu …' (the change from … to …) is often used. The dative follows these prepositions.
Der Wechsel von der Schule zur Universität ist ein großer Schritt.
The transition from school to university is a big step.
'Wechsel' (change) is a very productive word and forms many useful nouns. Examples are 'der Wetterwechsel' (change in the weather), 'der Stimmungswechsel' (change of mood), or 'der Jahreswechsel' (turn of the year).
Der plötzliche Wetterwechsel hat viele überrascht.
The sudden change in the weather surprised many people.
In the context of banks, travel, or currencies, 'der Wechsel' (exchange) almost always refers to exchanging money. An important related word is 'der Wechselkurs' (exchange rate).
Vor der Reise nach England mussten wir einen Wechsel von Euro in Pfund machen.
Before the trip to England, we had to exchange euros for pounds.
The meaning as a financial instrument is outdated today. You will find it almost only in historical texts about trade and finance in the 19th and early 20th centuries.
Der Kaufmann bezahlte die Lieferung mit einem Wechsel.
The merchant paid for the delivery with a bill of exchange.
change
When starting a new job, Wechsel and Veränderung can describe the same situation. Wechsel emphasizes that the previous job is replaced by another one, while Veränderung more generally says that one's professional life is becoming different. For a specific new job, Wechsel is usually more precise.

Der Wechsel zu einer anderen Arbeitsstelle fiel ihr zuerst schwer.
At first, switching to another job was difficult for her.
Die Veränderung in ihrem Berufsleben fiel ihr zuerst schwer.
At first, the change in her professional life was difficult for her.