A week is 7 days in connecting order. There are usually 52 weeks in a year.

In the English language, the days of the week are named after gods in Norse mythology, except for Saturday, which is named after a Roman god.

English name Abbreviation Norse mythology Roman mythology Old English name
Sunday Sun. Sun's day Sunnadaeg
Monday Mon. Moon's day   Monnadaeg
Tuesday Tue. Tyr's day Mars Tiwsdaeg
Wednesday Wed. Wodan's (Odin's) day Mercury Wodensdaeg
Thursday Thu. Thor's day Jupiter Thursdaeg
Friday Fri. Freyr's day Venus Fridaeg
Saturday Sat. Saturn's day Saturnsdaeg

Depending on the law of a country, the week either starts on Monday and ends on Sunday, or starts on Sunday and ends on Saturday. In most countries, Saturday and Sunday are the weekend. Friday, Saturday, and Sunday is a religious day for Muslims, Jews, and Christians, respectively.

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Days of the Week
Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday