Many Muslims will not eat or drink water during daylight, which at this time of year can last about 16 to 19 hours, depending on your UK location.
Fasting ends at sunset with a meal, known as the Iftar.
Ramadan is determined by the lunar cycle and will run from 6 June to about 5 July this year.
The timing shifts each year in relation to the Western calendar.
Earlier this year, exam boards said key GCSE and A-level examinations were timetabled this summer to take into account the holy month.
`Longest` Muslim holy month of Ramadan in 33 years begins
07 June 2016
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Muslims in the UK are facing the "longest" Ramadan in 33 years, as the holy month coincides with the summer solstice, meaning long days of fasting.
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