Tens of thousands of mourners filtered into St. Peter's Basilica in Rome on Wednesday to pay their final respects to Pope Francis.

In a small church tucked into a side street in northern China's Hebei province, a group of around 10 people gathered for their weekly meeting, the day after Pope Francis died aged 88. Others who gathered said they were "shocked" to hear of his death because it "seemed so sudden" -- especially after he had made an appearance at the Vatican the previous day,

Francis advocated for the powerless, for those who have so little and yet are villainized by people in positions of authority.'

So many mourners lined up to see Pope Francis lying in state in a simple wooden coffin inside St. Peter’s Basilica that the Vatican kept the doors open all night due to higher-than-expected turnout, closing the basilica for just an hour Thursday morning for cleaning.

As leaders from around the world pay tribute to the late Pope Francis, China's President Xi Jinping has not offered his condolences.

Pope Francis's funeral is on Saturday, and now's the time to familiarize yourself with a few Catholic terms and phrases that you will hear this week.