How can prepared statements protect from SQL injection attacks

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In what ways do prepared statements aid in the defense against SQL injection attacks?

Wikipedia says:

Prepared statements are resilient against SQL injection, because parameter values, which are transmitted later using a different protocol, need not be correctly escaped. If the original statement template is not derived from external input, SQL injection cannot occur.

I am having trouble understanding the cause. What are some examples and a straightforward explanation in basic English?

Aug 11 in Database by Kithuzzz
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