Shrove Tuesday is a term commonly known in English-speaking countries associated with the United Kingdom and its Anglican traditions, especially Canada, Ireland, Australia[1], New Zealand, and parts of the United States[2] for the day preceding Ash Wednesday, the first day of the Christian season of fasting and prayer called Lent.
The word shrove is the past tense of the English verb shrive, which means to obtain absolution for one's sins by way of confession and doing penance. During the week before Lent, sometimes called Shrove tide in English, Christians were expected to go to confession in preparation for the penitential season of turning to God. Shrove Tuesday was the last day before the beginning of Lent on Ash Wednesday, and noted in histories dating back to 1000 AD. The popular celebratory aspect of the day had developed long before the Protestant Reformation, and was associated with releasing high spirits before the somber season of Lent. It is analogous to the continuing Carnival tradition associated with Mardi Gras (and its various names in different countries) that continued separately in European Catholic countries.
In the United States, the term "Shrove Tuesday" is less widely known outside of people who observe the liturgical traditions of the Episcopal, Lutheran, Methodist, and Roman Catholic Churches.[3][4] Because of the increase in many immigrant populations and traditions since the 19th century, and the rise of highly publicized festivals, Mardi Gras has become more familiar as the designation for that day.
In the United Kingdom and many other countries, the day is often known as Pancake Day. Making and eating such foods was considered a last feast with ingredients such as sugar, fat and eggs, whose consumption was traditionally restricted during the ritual fasting associated with Lent.
en.wikipedia.org