Grammar in Use Countable and uncountable 2
Travel (noun) means ‘travelling in general’ (uncountable). We do not say ‘a travel’ to mean a trip or a journey:
・They spend a lot of money on travel.
・We had a very good trip/journey. (not a good travel)

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https://www.ldoceonline.com/dictionary/travel
You use travel to talk in general about the activity of travelling:
・Long-distance travel has become much cheaper.
・My interests are travel and photography.

Travel is only used as an uncountable noun.
✗Don't say: a travel | the travel

travels
Someone’s travels are their journeys to many different places:
・On her travels, she visited Egypt, Jordan, and South Africa.
・I’ll call you when I get back from my travels.

Travels is always used as a plural noun in this meaning.
✗Don’t say: her travel | my travel

sなしtravelは概念名詞で個々の旅行を言うのには使えない。
特定の旅行を言う場合は複数形かtrip他を使う。