Do sonnets need to be in iambic pentameter?

Related questions

1. Is Julius Caesar written in iambic pentameter?
2. How do you make an iambic pentameter?
3. Why would a poet use iambic pentameter?
4. Can iambic pentameter have 11 syllables?
5. Does iambic pentameter rhyme?
6. Are all Shakespeare plays written in iambic pentameter?
7. What is stressed and unstressed syllables in poetry?
8. What is iambic pentameter?
9. Is Ing stressed or unstressed?
10. What is an unstressed syllable called?

Tags

1. #lines
2. #pentameter
3. #every
4. #rhyme
5. #changed
6. #words
7. #everything
8. #there
9. #iambic
10. #beats
11. #stressed
12. #means
13. #sonnet
14. #syllables
15. #which
16. #rhymes
17. #nearly
18. #usually