The season's finale took place on 17 January 2021 with Aari Arjunan winning the Bigg Boss title with the highest number of voting percentage in the history of Bigg Boss Tamil franchise, whereas Balaji Murugadoss emerged as the first runner-up.

[2] Anitha Sampath, Balaji Murugadoss, Ramya Pandian and Suresh Chakravarthi returned as contestants in Bigg Boss Ultimate.

This season, the logo is a colorful eye with a pupil that resembles a compass, filled with multiple colours.

As with the past three seasons, the house is located at EVP FILM CITY in Chennai, Tamil Nadu.

Rather than warm colours from the last season, this time, the house has been fully designed in vibrant shades with gaudy lights.

[3][4] The participants in the order of appearance and entry in house are:[5][6] Each week, two housemates who did not perform well in the Luxury Budget Task, are sent to the Bigg Boss Prison.

On Day 22, the housemates in the Bigg Boss House celebrated the festival Navratri (Vijayadasami), in which the contestants cooked a feast, played village games, danced to songs, and decorated the Bigg Boss House.

Then the contestants were asked express their talents on the stage placed in the garden area.

On Day 105, all the 13 evicted and walked housemates (Rekha, Velmurugan, Suresh, Suchitra, Samyuktha, Sanam, Ramesh, Nisha, Archana, Anitha, Aajeedh, Shivani, and Gabriella) were invited to the Bigg Boss Finale.

At the end of the show, Aari Arjunan was then declared the Winner of Bigg Boss 4, followed by Balaji Murugadoss, Rio Raj, Ramya Pandian, and Somshekar.

Day 9: The housemates in the Bigg Boss House will have to perform a task, which involves them throwing balls.

Housemates have to pair up and select one representative to throw a ball in a bowl located in the garden area.

Coincidentally, the House Captain Archana was in Balaji's team and was given a day–off from her captaincy on Day 24.

There were pairs in ramp walk dance The participants Somshekar, Samyuktha, Archana, Rio, Aari, and Gabriella are asked to hold a wooden plank with a block representing their photos and names.

Day 81: When each housemate catches a golden ball they get to pick a special advantage which will be displayed on the board.

Day 99 - 103: During the final week the public vote for who they want to win Bigg Boss.