It is one of the five pillars of Islam, observed by billions of Muslims across the globe - including 3,372,966 in the UK - but today marks the start of the world’s lockdown Ramadan.
Usually a time for fasting, reflection and charity work, 2020 has seen Muslims looking for new ways to observe rules and share food and time together.
Digital technology is being used to help people enjoy online prayers and sermons, as well as to give to charity during the month-long celebration.
Some key elements of Ramadan are undergoing radical change. Iftar, the meal to break the fast at sunset, is usually a time when friends and family come together to enjoy a feast of delicious food.