She hopes to travel the world someday.
Here, the word "to travel" is -

• Correct Answer: She hopes to travel the world someday. Here, the word "to travel" is - Non-finite verb.

• Non-finite verb:
- A non-finite verb is a verb that does not show tense, person, or number.
- Non-finite verb সাধারণত তিন প্রকার। যথা:
01. Infinitive,
02. Gerund,
03. Participles.

• যে verb দ্বারা Sentence এর বক্তব্য শেষ হয় না ও কোনো Subject এর Number ও Person দ্বারা যার রূপ নির্ণয় করা যায় না তাকে Non-finite verb বলে। যেমন:
- She hopes to travel the world someday.
- এই Sentence এ "to travel" হচ্ছে Infinitive verb.
- Infinitive verb হচ্ছে Verb এর base form অথবা to + base form.

• Finite verb:
- A finite verb is a verb that has a subject and shows tense.
- Finite verbs are not gerunds, infinitives, or participles, which are classified as non-finite verbs.
- Tense এর গঠন অনুসারে যে verb বসে, সেটিই Finite Verb.
- Example: They played football yesterday.

Source: A Passage To The English Language S. M. Zakir Hussain.