Passport stamps • English Conversation Questions

What is the purpose of passport stamps?
When and where do passport stamps typically get issued?
Do all countries provide passport stamps upon entry and exit?
What information do passport stamps contain?
Can passport stamps be a cause for concern or complications during travel?
Do passport stamps expire, or do they remain valid indefinitely?
Are there any specific rules or restrictions on collecting passport stamps as a hobby?
Can I request not to have a passport stamp for any reason?
What should I do if I encounter issues with passport stamps, such as missing or incorrect stamps?
Do digital or electronic passports also receive physical passport stamps?
Are there any special passport stamps that are highly sought after or have unique significance?