but; however
A conjunction meaning 'but' or 'however', used to contrast two statements.
Demo is a conjunction that you put at the beginning of a new sentence to show contrast with the previous sentence. It is very common in everyday conversation and writing. For example, you might say something positive and then add a negative with demo, or state an opinion and then a reservation. It is similar to English 'but' or 'however', but note that it always starts a new sentence, not joining two clauses with a comma. If you want to join two clauses within one sentence, you would use 'ga' instead. Also, be aware that 'demo' has another meaning: when used after a noun or in certain patterns, it can mean 'even' or 'or something', but here we are focusing on the 'but' meaning at the start of a sentence.