The Char Dham is a collection of four pilgrimage locations in India. The name means "four abodes." Visits to these locations are thought to aid in achieving moksha. (salvation). Badrinath, Dwarka, Puri, and Rameswaram are the four Dhams. Every Hindu is supposed to travel to the Char Dhams at least once in their lives. According to Adi Shankaracharya, there are four Hindu pilgrimage locations that make up the Char Dham. These primary "dhamas" are Lord Vishnu shrines, while Rameshwaram is a Lord Shiva shrine. The Dham of Satyuga is Badrinath in Uttarakhand, and all the "dhamas" are connected to the four epochs. Rameswaram, Tamil Nadu, the Dham of the Tretayuga Dwaparayuga Dham at Dvaraka, Gujarat, Jagannatha Puri in Odisha, a Dham of the Kaliyuga.
The Chota Char Dham is a smaller, more well-known pilgrimage route in North India that includes the four pilgrimage sites of Yamunotri, Gangotri, Kedarnath, and Badrinath in the state of Uttarakhand. If you decided for a chardham yatra you can see the kedarnath yatra and other yatra's tour details here.
Hinduism holds that Badrinath rose to prominence because Nara-Narayana, a Vishnu avatar, performed Tapasya there. Before then, the area was covered in berry trees. Since berries are known as "badri" in Sanskrit, the location was given the name Badrika-Vana, or "the forest of berries." A great berry tree developed over the location where Nara-Narayana performed Tapasya, shielding him from the rain and the light. Locals hold that Mata Lakshmi changed into a berry tree in order to save Lord Narayana. Narayana claimed that after Tapasya, people would always refer to Him as Lakshmi rather than Narayana, which is why Hindus do so. As a result, it was given the name Badri-Nath, which means "King of Berry Forest."
The second location, Rameswaram, gained significance during the Treta Yuga when Lord Rama constructed a Shiva-Lingam there and worshipped it in order to obtain Lord Shiva's blessings. Rameswaram means "God of Rama" in Sanskrit. There are also said to be footprints left by Bhagwan Ram. NV.
The third, Dwaraka, gained prominence in the Dvapara Yuga when Lord Krishna chose to stay there rather than His home, Mathura.
The fourth is Puri, where Lord Vishnu is worshipped as Jagannatha, his Avtara for the Kali Yuga that is currently in effect.