Diwali or Deepavali both are same festival no difference

Diwali
Diwali, also called Deepavali, is a major Indian festival that is very significant in Hinduism, Sikhism, and Jainism. Known as the "Festival of Lights," it symbolises the victory of good over evil, and lamps are lit as a sign of celebration and hope for humankind. Celebrations focus on lights and lamps, particularly traditional or deeya (earthen lamp, as illustrated). Fireworks are associated with the festival. Diwali is a colloquial name used in North India, while the festival is formally called Deepavali in South India.
Diwali is celebrated for three consecutive days at the end of Hindu month of Ashwayuja. It usually occurs in October/November, and is one of the most popular and eagerly awaited festivals in India. Diwali comes exactly twenty days after Dussehra. Hindus and Sikhs alike regard it as a celebration of life and use the occasion to strengthen family and social relationships. For Hindus it is one of the most important festivals, and beginning of the year in some Hindu calendars. There are several beliefs regarding the origin of the holiday. The most repeated version is that Hindus celebrate Diwali to mark the time when Lord Rama achieved victory over Ravana. Some also view it as the day Krishna defeated the demon Narakasura or in honor of the day Bali went to rule the nether-world, obeying the order of Vishnu. It is also a significant festival for the Sikh faith. In India, diwali is now considered to be more of a national festival, and the aesthetic aspect of the festival is enjoyed by most Indians regardless of faith.
Significance in Hinduism
The festival marks the victory of good over evil. The Sanskrit word Deepavali means an array of lights that stands for victory of brightness over darkness. As the knowledge of Sanskrit diminished, the name was popularly modified to Diwali, especially in northern India. In South India, Diwali does not coincide with the beginning of a new year as South Indians follow a different calendar, the calendar. On the day of Diwali, many wear new clothes, share sweets and snacks, and light firecrackers. Some North Indian business communities start their financial year on Diwali and new account books are opened on this day.Hindus find cause to celebrate this festival for different reasons.
Esoteric Significance
While Deepavali is popularly known as the "festival of lights", the most significant esoteric meaning is "the awareness of the inner light".
Central to Hindu philosophy, is the assertion that there is something beyond the physical body and mind which is pure, infinite, and eternal, called the Atman. Just as we celebrate the birth of our physical being, Deepavali is the celebration of this Inner Light, in particular the knowing of which outshines all darkness (removes all obstacles and dispels all ignorance), awakening the individual to one's true nature, not as the body, but as the unchanging, infinite, immanent and transcendent reality. With the realization of the Atman, come universal compassion, love, and the awareness of the oneness of all things (higher knowledge). This brings Ananda.2) Naraka Chaturdasi: Chaturdasi is the fourteenth day on which demon Narakasura was killed. It signifies the victory of good over evil and light over darkness (Gujarati: Kali Chaudas). In south India, this is the actual day of festivities. Hindus wake up way before dawn as early as 2.00 in the morning, have a fragrant oil bath and wear new clothes. They light small lamps all around the house and draw elaborate kolams /rangolis outside their homes. They perform a special puja with offerings to Lord Sri Krishna or Lord Sri Vishnu, as he liberated the world from the demon Narakasura on this day. It is believed that taking a bath before sunrise, when the stars are still visible in the sky is equivalent to taking a bath in the holy Ganges. Hence, when people greet each other in the morning, they ask "Have you performed your Ganga Snaanam?". After the puja, children burst firecrackers heralding the defeat of the demon. As this is a day of rejoicement, many will have very elaborate breakfasts and lunches and meet family and friends. In the evening, lamps are again lit and Goddess Lakshmi is worshipped and offered special dishes. This being a no moon day, many will offer special tarpana (offerings of water and sesame seeds) to their ancestors.
3) Diwali: the actual day of Diwali, is celebrated on the third day of the festival, when the moon completely wanes and total darkness sets in the night sky.
4) Govardhan Puja or also called Annakut is celebrated as the day Krishna defeated Indra. For Annakut a mountain of food is decorated symbolizing Govardhan Mountain lifted by Lord Krishna. In Maharashtra it is celebrated as Padva or BaliPratipada. The day commemorates King Bali. Men present gifts to their wives on this day.
5) Bhayiduj (also Bhayyaduj, Bhaubeej or Bhayitika) — on this day, brothers and sisters meet to express their love and affection for each other (Gujarati: Bhai Bij, Bengali: Bhai Phota). Most Indian festivals bring together families; Bhaiduj brings together married sisters and brothers, and is a significant festive day for them. This festival is ancient, and pre-dates 'Raksha Bandhan' another brother-sister festival being celebrated today.
Firecrackers
To enhance the joy of Diwali both the young and the old light firecrackers and fireworks at night. Nowadays there is a significant growth in campaigns on creating awareness over the adverse impacts of noise and air pollution. Some Governments drive to keep the festival less noisy and pollution-free. The Tamil Nadu Pollution Control Board has banned production of crackers with over 125 decibel levels. In survey of UP Pollution Control Board, it was revealed that the emission of smoke was found more in the light illuminating fire crackers. Levels of SO2 (Sulphur dioxide) and RSPM (respirable suspended particulate matter) was found marginally higher on Diwali day. Crackers, which use large quantities of sulphur and paper, spew out sulphur dioxide and charcoal into the air. Considering these facts, bursting of crackers is prohibited in silent zones i.e. near hospitals, schools and courts.