How can standing waves be created on a string fixed at both?

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Standing waves on a string fixed at both ends are formed through the interference of two waves traveling in opposite directions. These waves must have the same frequency and amplitude to create the characteristic nodes and antinodes of standing waves. The string must be set into motion, which can occur by plucking or striking the string at a point, such as the middle. Fixing the ends of the string allows for specific wavelengths and frequencies to resonate, leading to the formation of standing waves. Understanding this principle is essential in the study of stringed musical instruments.
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Hello. So I am having some trouble answering this question and I would really appreciate some help.

I figure I should probably first define what standing waves are and I know that they are the result of the repeated interference of two waves of identical frequency while moving in opposite directions along the same medium or in this case, the string.

Im just not sure how to answer the question. I know that in order the there to be a standing wave, the string needs to be moving or vibrating but I am not sure where fixed at both ends comes in.
 
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If the string is fixed at both ends then the waves cannot have been generated by wiggling the endpoints. They could have been generated by driving the string in the middle (for instance with a guitar pick). Or they could have always been there.
 
Hello, are you familiar with any stringed musical instruments?
 

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