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Twitter is a social media platform, lot's of people use Twitter to connect with each other. Trends is one of the best features on Twitter. the trend means if lots of people are writing or sharing one topic that topic will show as a trend on Twitter.
So if you want to know what is the most discussing topic on Twitter then just visit trend.earnfo.com and you can find what is trending on Twitter right now.
Twitter shows lots of countries trending hashtags separately, so that if anyone from this country can find easily trending topics in their region. similarly, if you won't know what is the most trending topic worldwide then you can find what is trending on Twitter in worldwide.