Eid is a Arabic word it means festival. There are two big festivals in Muslim culture 1) Eid ul Fitr and 2) Eid ul Adha. These two Eids festivals we celebrated in two different Islamic Lunar months all around the world.
On the day of Eid people enjoy and express happiness and offer prayers in the form of group.....usually they gather in an Open land or in a Mosque and tonnes of people join together and pray in congregation and ask Allah ( The God ) for His blessing, forgiveness of all sins and ask for success in this life and hereafter that is good life. Also they ask for the true path to live in this life and get forgiveness for all sins and get destination that is heaven, which Muslims believe will bring success in this life and hereafter only if they lead this life on true path, never lie, never harm to others with their hand and with their tongue and believe uniformity in all human beings and are never proud on themself and we think God has blessed us with this quality and we are always thankful to our god and try to help others especially the poor, before all should have faith in the Oneness of God. So it is clear that Eid celebration is not only an expression of our happiness but also it express the spiritual happiness. After Eid prayers and meeting on the occasion of Eid , people hug eachother. Eid is the time to spread happiness, love and triumph thereby creating enthusiasm among all the family members.
EID UL FITR festival, is also called feast of breaking the fast. Ramadhan is the holy month of Muslims. Allah (The God) revealed the Holi Quran to Prophet Mohammad during this month. Once the crescent moon is sighted, the Ramadhan month comes to an end and on the first day of Islamic lunar month Shawwal , it's now the time for celebrations for people of Muslim cultur. In the whole month of holy Ramadhan, Muslims keep fasting and from sunrise to sunset everyday they eats and drink nothing. Muslims believe, after almost 600 years of Prophet Jesus, the God sent Prophet Mohammad into this world to show the right path to human mankind to live in this world and believe in the oneness of God, Pray 5 times, keep fasting, do charity, go on pilgrimage. God makes the whole month of Ramadhan fasting is obligatory. After this He gives a fruitful end in name of festival Eid ul Fitr festival and it also called Ramadhan festival. On this holy occasion people give Charity to poor so that poor people also can celebrate the festival and wear new clothes and go for special Eid prayer ceremony near by mosque to thank God by reciting various prayers. After the prayer there is get together at Muslim's house for Eid meal, which has special dishes and variety of desserts. After that people go to their relatives and friends place and meet them and greet them Eid's happiness or Happy Eid.
EID UL ADHA festival, celebrated on the 10th day of last Islamic Lunar month, is also called feast of the Sacrificed. The Eid ul Adha celebrates in the remembrance of Prophet Ibrahim's readiness to sacrifice his son Ismail to God as an act of submission to God's command and his son's acceptance to being sacrificed, before God intervened to provide Prophet Ibrahim with a Sheep to sacrifice instead. On another occasion God ordered Prophet Ibrahim to leave his wife Hajira and son Ismail alone far away, He again sacrificed his love for his son and He left them far away with a huge amount of food grains but after sometime Mother and son had nothing left and then a infant was crying for thirst and dehydration. Miraculously god started one spring of water from the earth at the feet of Ismail. This water never got stopped from that time and its name is ZAM ZAM water and it is believes to be Holy Water in Muslim culture. Later Prophet Ibrahim instructed by the God to build a Holy building in front of that Holy spring water well. It's name is Kaaba in Mecca, Saudi Arabia. In the remembrance of Prophet Ibrahim's sacrifices, Muslims Celebrates Eil ul Adha. At the time of Eid ul Adha people go to Hajj Pilgrimage, and People give sacrifice of sheeps, cows, camels with the remembrance of the sacrifice given by the Prophet Ibrahim and followed and Obeyed what His God ordered. Muslims believe they obey the same God of Prophet Ibrahim who is very near to the God.
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Religion plays a significant role in Muslim culture. Muslims believe in Oneness of God. Their concept of religion is Oneness of God. They celebrate festivals because of God's order. Muslim try to spend their live as per Gods wishes, Likewise in their Festivals Muslims remember their God and they celebrate Eid ul Fitr and Eid ul Adha for the sake of God's mercy and heaven after death.