Courtesy: https://twitter.com/saffronicman/status/1575455184544595968?s=46&t=cz0pu3ti0J6PavBzWkTs9w
Karpur Gauram Karunavtaaram is one of the most famous mantras that you would hear at the time of a Mangal Aarti. It is an ancient Sanskrit Shloka related to Bhagwan Shiva and is also known as Shiva Yajur Mantra.

कर्पूरगौरं करुणावतारं
संसारसारम् भुजगेन्द्रहारम् ।
सदावसन्तं हृदयारविन्दे
भवं भवानीसहितं नमामि ॥
Karpur Gauram Karunavtaaram mantra is found in Yajurveda, one of the four Vedas.
The word Shiva signifies the auspicious. Bhagwan Shiva roots out sin and terror and is the bestower of earthly happiness, promoter of good and auspiciousness. Shiva is also called Sankara, which means doer of good. Shiva takes one beyond the three bodies (Tripura), gross, subtle, and causal, that envelope the Jeeva or the embodied soul. He is hence the Hara, the remover of all evil and the idol of renunciation.

karpūragauraṁ– The divine one, who is white as Camphor / pure as camphor
karuṇāvatāraṁ– who is an embodiment of solicitude and compassion
sansārsāram– The true spirit of the universe
bhujagendrahāram– The one who draped the serpent king
sadāvasantaṁ hṛdayāravinde– one who resides in the heart that is pure as lotus (though lotus is born in mud, it stays untouched by the mud). In the heart that is untouched by worldly matters.
bhavaṁ bhavānīsahitaṁ namāmi– I bow to Bhagwan Shiva and his companion/consort
Mata Bhavani (Maa Parvati’s form)
It is believed that the chanting Shiva mantra has miraculous benefits. Karpur Gauram is the Shiva mantra that was found in Yajurveda. The benefit of Karpur Gauram Mantra are
Daily chanting eliminates the trouble from the paths of Shiva bhaktas.
It helps them deal with every challenging situation in life. Chanting the mantra every day helps to improve concentration. It assists with the psyche, developing fixation and concentration.
It assists with adjusting to Universe and within us.
Bhagwan Shiva is the incarnation of compassion and is easily pleased by the prayers of his devotees. It is believed that you can achieve anything with hard work by chanting the mantra daily.
This strota is considered among the most powerful mantras of protection; it protects us from negativity, dangers, and enemies. Chanting Shiva’s mantra regularly changes our vibrations and energies both within our body and outside and brings us success and prosperity in all areas of our life.