
anzünden
to light
To set something on fire or make it burn.
Er zündete die Kerzen auf dem Geburtstagskuchen an.
He lit the candles on the birthday cake.
to light / ignite
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to light
To set something on fire or make it burn.
Er zündete die Kerzen auf dem Geburtstagskuchen an.
He lit the candles on the birthday cake.

to ignite
Figuratively, to deliberately trigger or provoke something negative, such as an argument or conflict.
Mit seiner unbedachten Äußerung hat er eine heftige Debatte angezündet.
With his careless remark, he ignited a heated debate.
'Anzünden' (to light / ignite) is a separable verb. The prefix 'an' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich zünde den Kamin an.
I light the fireplace.
When you light something for yourself, the reflexive dative construction 'sich etwas anzünden' (to light something for oneself) is often used. The object is in the accusative.
Er zündete sich eine Zigarette an.
He lit himself a cigarette.
In its literal meaning, 'anzünden' (to light) is often combined with things that can burn. Typical examples are: eine Kerze anzünden (to light a candle), ein Feuer anzünden (to light a fire), ein Streichholz anzünden (to light a match), or den Kamin anzünden (to light the fireplace).
Zum Advent zünden wir jeden Sonntag eine weitere Kerze an.
During Advent, we light one more candle every Sunday.
You can recognize the figurative meaning by the fact that the object is an abstract noun. Common combinations are 'einen Streit anzünden' (to ignite an argument), 'eine Diskussion anzünden' (to ignite a discussion), or 'eine Debatte anzünden' (to ignite a debate).
Seine provokante Frage hat im Team einen heftigen Streit angezündet.
His provocative question ignited a heated argument in the team.
to ignite / to become inflamed / to spark
Both verbs can mean causing something to burn. Anzünden is the usual choice in everyday language. Entzünden refers to the same action but sounds more formal or literary.

Am Abend zündet der Wächter die Fackel an.
In the evening, the guard lights the torch.
Bei Beginn der Zeremonie entzündet der Wächter die Fackel.
At the beginning of the ceremony, the guard lights the torch.