Before the creation of Entire Universe. When there was darkness everywhere.. An absolute Shunya, nothing was there, Par Brahman (Supreme Being) divided itself into 2 Major Parts:- (Purush and Prakriti). Purush- The Masculine form of Par Brahman divided itself into 3 main energies (Gods)- Brahma, Vishnu and Shiva. Different to Purans have different observations. Prakriti- The Feminine form of Par Brahman got divided into 3 energies (Goddesses)- Saraswati, Lakshmi and Shakti. So, this holy Trinity if we see, the three Gods- Brahma (Creator), Vishnu (Preserver) and Shiva (Destroyer) are collectively called Tridev. The three Goddesses that help their consorts (Tridev) are collectively called Tridevi- Saraswati (Knowledge), Lakshmi (Wealth) and Shakti (Power). Lord Brahma’s wife is Goddess Saraswati, Lord Vishnu’s wife is Goddess Lakshmi and Lord Shiva’s wife is Shakti who later got the name ‘Parvati’ (after taking birth as the daughter of mountains, that’s why her first form is Shailputri). So I hope my answer will help you. Thank you and have a nice day ahead.
Lord Brahma with Goddess Saraswati
Lord Vishnu with Goddess Lakshmi
Lord Shiva with Goddess Shakti (also known as Parvati or Durga)