Conjunction - が - However - but, however
が is used to join multiple sentences together and can be compared to the English word 'But'. For example: 猫は速いですが大きいじゃない (The cat is fast, but not big).
When context makes the second sentence obvious, the second sentence can also be dropped.
Sample sentences
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私のコートは軽いが暖かい
My coat is light but warm