When you mark an index entry, Word creates a field that it uses to build the index.

Name: When you mark an index entry, Word creates a field that it uses to build the index.
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When you mark an index entry in Word, it creates a hidden field that is used to generate the index. This field contains information about the text and location of the index entry within the document. When you update the index, Word uses this field to update the entries in the index based on the current contents of the document.

When You Mark an Index Entry, Word Creates a Field