Final answer:
A prefix changes a word's meaning by attaching to the beginning, and common prefixes aid in understanding unfamiliar words.
Explanation:
A prefix is a word part added to the beginning of a word that changes the word's meaning. For example, the prefix 'un-' added to the word 'happy' changes its meaning to 'unhappy'.
Understanding common prefixes like 'pre-', 'post-', 're-', 'anti-', 'bi-', or 'tri-' can help in deciphering unfamiliar words.
Remember that a prefix comes before the base word, while a suffix comes after, like '-ing' in 'running'.
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