mentalism refers to a form of entertainment or performance art that creates the illusion of mind-reading, telepathy, or other psychic abilities. Mentalists use a combination of psychological techniques, observational skills, suggestion, and showmanship to make it appear as though they can read people's minds.
It's essential to understand that mentalism is not a genuine paranormal or supernatural ability. Instead, it relies on a deep understanding of human behavior, body language, and communication patterns to make educated guesses and seemingly predict or know personal information about individuals from their responses and reactions.
Regarding Suhani Shah and Karan Singh, I do not have specific information about them I wouldn't be aware of those as my knowledge is limited to that point. I recommend checking more recent sources or news updates to learn about any recent performances or demonstrations by Suhani Shah and Karan Singh.