TIL: The Arabic phrase alhamdulillah (ٱلْحَمْدُ لِلَّٰهِ) means "praise be to God" and is sometimes translated as "thank God" or "thanks be to the Lord". It's also known as Tahmid, which means "praising" in Arabic.
Muslims often say alhamdulillah to express gratitude and appreciation for Allah, believing that Allah deserves praise and gratitude at all times. They say it in both good and bad times, when things go their way and when they don't. Alhamdulillah can also be used to express satisfaction, to discuss accomplishments, or to acknowledge fortunate circumstances. People also say alhamdulillah after finishing a meal or after sneezing.
A longer version of the phrase is al-ḥamdu l-illāhi rabbi l-ʿālamīn (ٱلْحَمْدُ لِلَّٰهِ رَبِّ ٱلْعَالَمِينَ), which means "all praise is due to God, Lord of all the worlds". This is the first verse of Surah Al-Fatiha, the opening chapter of the Quran.