die Saite
string
A thin, stretched thread made of metal, plastic, or gut on a musical instrument, which is made to sound by plucking, bowing, or striking.
Bei meiner Gitarre ist eine Saite gerissen.
A string on my guitar broke.

string
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string
A thin, stretched thread made of metal, plastic, or gut on a musical instrument, which is made to sound by plucking, bowing, or striking.
Bei meiner Gitarre ist eine Saite gerissen.
A string on my guitar broke.

You can recognize the literal meaning from the context of musical instruments such as a guitar or violin. The idiom 'andere Saiten aufziehen' (to get tougher) is always connected with a change in behavior or stricter rules.
Der Musiker wechselt die Saiten seiner Violine.
The musician changes the strings on his violin.
In a musical context, 'Saite' (string) is often combined with certain verbs: Saiten 'aufziehen' (to put on new ones), Saiten 'stimmen' (to tune), or eine Saite 'reißt' (a string breaks).
Vor dem Konzert muss ich noch die Saiten meiner Gitarre stimmen.
Before the concert, I still have to tune the strings on my guitar.
The idiom 'andere Saiten aufziehen' (to get tougher) is a fixed unit. The person who becomes stricter is the subject of the sentence.
Die neue Chefin hat im Team sofort andere Saiten aufgezogen.
The new boss immediately got tougher with the team.
wire
'Draht' and 'Saite' can both be thin, long things, often made of metal. The most important difference is their purpose. A 'Draht' is used, for example, for fences, electrical cables, or crafts. A 'Saite' belongs to a musical instrument and is stretched so that it produces sound. Learners may confuse the words because a string is sometimes also made of metal and looks like wire. When it is about music, you say 'Saite'. When it is about technology, fastening, or crafts, you say 'Draht'.

Beim Üben ist mir eine Saite der Gitarre gerissen.
While I was practicing, a string on my guitar broke.
Für den Gartenzaun brauchen wir noch festen Draht.
We still need sturdy wire for the garden fence.