Chaand Raat (literally, Night of the Moon) is a Hindi, Urdu and Bengali locution used in India, Pakistan and Bangladesh for the eve of the Muslim festival of Eid; it can also mean a night with a full moon. The term is derived from the Sanskrit words candrá "moon" and ratri "night".

Chaand Raat is a time of celebration when families and friends gather in open areas at the end of the last day of Ramadan to spot the new moon, which signals the arrival of the Islamic month of Shawwal and the day of Eid. Once the moon is sighted, people wish each other Chaand Raat Mubarak ("Have a blessed night of the new moon") or Eid Mubarak ("Blessings of the Eid day"). Women and girls decorate their hands with mehndi (henna), and people prepare desserts for the next day of Eid and do the last round of shopping.

City streets have a festive look, and brightly decorated malls and markets remain open late into the night. In socio-cultural significance, this night is comparable to Christmas Eve in Christian nations.

Eid al-Adha or the Festival of Sacrifice is a religious festival celebrated by Muslims and Druze worldwide as a commemoration of God's forgiveness of Ibrahim (Abraham) from his vow to sacrifice his son, as commanded by Allah. (Muslim tradition names Ishmael as the son who was to be sacrificed, whereas the Judeo-Christian tradition names Isaac.) It is one of two Eid festivals celebrated by Muslims, whose basis comes from the Quran. (Muslims in Iran celebrate a third, non-denominational Eid.) Like Eid el-Fitr, Eid ul-Adha begins with a short prayer followed by a sermon(khutba).

Eid ul-Adha annually falls on the 10th day of the month of Dhul Hijja of the lunar Islamic calendar. The festivities last for two to three days or more depending on the country. Eid ul-Adha occurs the day after the pilgrims conducting Hajj, the annual pilgrimage to Mecca in Saudi Arabia by Muslims worldwide, descend from Mount Arafat. It happens to be approximately 70 days after the end of the month of Ramadan.

Eid ul-Fitr or Id-Ul-Fitr, often abbreviated to Eid, is a Muslim holiday that marks the end of Ramadan, the Islamic holy month of fasting. Eid is an Arabic word meaning "festivity", while Fitr means "to break the fast" (and can also mean "nature", from the word "fitrah") and so symbolizes the breaking of the fasting period.

Eid ul-Fitr starts the day after Ramadan ends, and is verified by the sighting of the new moon. Muslims give money to the poor and wear their best clothes. Eid ul-Fitr lasts three days and is called "The Smaller Eid" compared with the Eid ul-Adha that lasts four days and is called "The Greater Eid".

On the day of the celebration, a typical Muslim family awakes very early, does the first everyday prayer, and is required to eat a little, symbolizing the end of Ramadan. They then attend special congregational prayers held in mosques, large open areas, stadiums and arenas. The prayer is generally short and is followed by a sermon (khutba). Worshippers greet and embrace each other with hugs in a spirit of peace and love after the congregational prayer. After the special prayers, festivities and merriment are commonly observed with visits to the homes of relatives and friends to thank God for all blessings.

Eid ul-Fitr is a joyous occasion with important religious significance, celebrating the achievement of enhanced piety. It is a day of forgiveness, moral victory, peace of congregation, fellowship, brotherhood and unity. Muslims celebrate not only the end of fasting but also thank God for the self control and strength that Muslims believe God gave them. It is a time of giving and sharing, and many Muslims dress in holiday attire.

Muharram is the first month of the Islamic calendar. It is one of the four months of the year in which fighting is prohibited. Since the Islamic calendar is lunar, Muharram moves from year to year when compared with the Gregorian calendar. Muharram is so called because it was unlawful to fight during this month; the word is derived from the word ‘haram’ meaning forbidden. It is held to be the most sacred of all the months, excluding Ramadan. Some Muslims fast during these days. The tenth day of Muharram is called Yaumu-l 'Ashurah, meaning, ‘the tenth day’, and it is a day of voluntary fasting. Fasting differs among the Muslim groupings; mainstream Shia Muslims stop eating and drinking during sunlight hours but do not eat until the evening. Sunni Muslims also fast during Muharram and on either the ninth or the eleventh day, the choice of which additional day being at the discretion of the individual.

Ramadan is a Muslim religious observance that takes place during the ninth month of the Islamic calendar, believed to be the month in which the Qur'an was revealed to Angel Gabriel, who later revealed it to the Prophet Muhammad. It is the Islamic month of fasting (sawm), in which participating Muslims do not eat or drink anything from dawn until sunset. Fasting is meant to teach the person patience, sacrifice and humility. Ramadan is a time to fast for the sake of God, and to offer even more prayer than usual. In Ramadan Muslims ask forgiveness for past sins, pray for guidance into the future, ask for help in refrain from everyday evils and try to purify themselves through self-restraint and good deeds.

The name "Ramadan" is the name of the ninth month; the word itself derived from an Arabic word *rmd as in "ramida" or "ar-ramad" denoting intense heat, scorched ground, and shortness of rations. It is considered the most venerated and blessed month of the Islamic year. Prayers, sawm (fasting), charity, and self-accountability are especially stressed at this time; religious observances associated with Ramadan are kept throughout the month.