The word Rāvaṇa (Sanskrit: रावण) means "Roaring" (active), the opposite of Vaiśravaṇa which means to "hear distinctly" (passive). Both Ravana and Vaiśravaṇa, who is commonly known as Kubera, are considered to be patronymics derived from "sons of Vishrava".

Ravana was a title later taken on by Dashānana, and it means "the one with ten (dasha) faces (anana)". Further, roravana is Sanskrit for "loud roaring." In Abhinava Gupta's Krama Shaiva scripture, yāsām rāvanam is used as an expression to mean people who are truly aware of the materialism of their environment.

Ravana has many other popular names such as Dasis Ravana, Dasis Sakvithi Maha Ravana, Dashaanan, Ravula, Lankapati, Lankeshwar, Lankeshwaran, Ravanasura and Ravanaeshwaran.

Ravana is depicted and described as having ten heads, although he is sometimes shown with only nine heads since he cut one off to convince Shiva. He is described as a devout follower of Shiva, a great scholar, a capable ruler, and a maestro of the Veena. Ravana is also depicted as the author of the Ravana Samhita, a book on Hindu astrology, and the Arka Prakasham, a book on Siddha medicine and treatment. Ravana possessed a thorough knowledge of Siddha and political science. In some later versions, he is said to have possessed the nectar of immortality, which was stored inside his belly thanks to a celestial boon from Brahma. In the War with Lord Rama, Ravana was killed by a powerful Brahma's weapon shot by Rama which was gifted to Rama by Sage Agstya.

Ravana was born to the Brahmin sage Vishrava and the Rakshasa princess Kaikasi in Treta Yuga. Villagers from Bisrakh in Uttar Pradesh claim that Bisrakh was named after Vishrava, and that Ravana was born there.

Ravana's paternal grandfather, the sage Pulastya, was one of the ten Prajapatis, or mind-born sons of Brahma, and one of the Saptarishi (seven great sages) in the first Manvantara (age of Manu). His maternal grandfather was Sumali (or Sumalaya), the king of the Rakshasas and the son of Sukesha. Sumali had ten sons and four daughters. Sumali wished for Kaikasi to marry the most powerful being in the mortal world, so as to produce an exceptional heir. He rejected the kings of the world, as they were less powerful than him. Kaikasi searched among the sages and finally chose Vishrava, the father of Kubera. Ravana and his siblings were born to the couple and they completed their education from their father, with Ravana being a great scholar of the Vedas.
Ravana and his two brothers, Kumbhakarna and Vibhishana, performed penance on Mount Gokarna for 10,000 years and won boons from Brahma. Ravana was blessed with a boon that would make him invincible to all the creations of Brahma, except for humans. He also received weapons, a chariot, as well as the ability to shapeshift from Brahma. According to the Ramayana, demigods approached Brahma since Ravana was causing harm on Earth. Lord Vishnu appeared and gave blessings that he will incarnate as a human (Rama) and kill Ravana since his invincibility boon did not include humans.
One of the most popular images of Shiva is called "Ravananugraha", which was popular in the Gupta era. It depicts Ravana beneath Mount Kailash playing a veena made out of his head and hands, and strings made out of his tendons, while Shiva and Parvati sit on top of the mountain. According to scriptures, Ravana once tried to lift Mount Kailash, but Shiva pushed the mountain into place and trapped Ravana beneath it. For a thousand years, the imprisoned Ravana sang Shiva Tandava Stotra, a hymn in praise of Shiva, who finally blessed him and granted him an invincible sword and a powerful linga (Shiva's iconic symbol, Atmalinga) to worship. But this incident has little to no evidence in Valmiki Ramayana.
Ravana's parents were the sage Vishrava (son of Pulastya) and Kaikesi (daughter of Sumali and Ketumati). Ravana had seventeen maternal uncles and three maternal aunts. Dhumraksha, Prahastha, Akampana, Vajramushti, Suparshwa and Virupaksha, a few of his maternal uncles, were generals in the Lanka army. Kaikesi's father, Sumali and uncle, Malyavan were instrumental in making Ravana the king of Lanka by advising him to receive boons from Brahma, defeat Kubera, and establish rakshasa rule in the three worlds.

Ravana's granduncle was

Read more on Wikipedia