Travel means ‘travelling in general’. It is uncountable.
- My interests are music and travel.
A journey is one ‘piece’ of travelling.
A trip is a journey together with the activity which is the reason for the journey.
I’m going on a business trip next week.
(= I’m going on a journey and I’m going to do some business.)
We do not usually use trip for journeys which take a very long time.