• wrote: Simple past (describes a completed action in the past)
• written: Past participle (used with helping verbs like 'have' or 'had')

Usage of “wrote”

• Indicates a completed action that happened at a specific time in the past.
• Usually stands alone without auxiliary verbs.
• Example: *She wrote a letter yesterday.

Usage of “written”

• Used with auxiliary verbs have, has, or had to form perfect tenses.
• Indicates an action that was completed before another time or has relevance to the present.
• Example: *I have written three emails today.

Summary

• Use wrote for simple past actions.
• Use written for perfect tenses with auxiliary verbs (have/has/had).
• Both forms relate to the act of composing text but differ in grammatical structure and time frame.