1- Taqiyyah, according to Ithna-`Ashri Rafidis, means presenting outwardly something that is different from what one believes inwardly, as an act of religious devotion. 2- Taqiyyah, according to Ahl as-Sunnah, is something to be resorted to when one has no other choice, and it is an extraordinary measure to be used only in times of extreme necessity. For more, see the detailed answer.
Taqiyyah from https://islamqa.info/en/answers/178975/what-is-taqiyyah