How do you greet a stranger in Arabic?

أَهْلاً (Ahlan): This is the most common way to greet someone in Arabic. It means "hello" or "welcome."

مَرْحَباً (Marhaba): This is another way to say "hello" or "welcome." It is more formal than أهلاً and is often used in written correspondence.

وَعَلَيْكُمْ السَّلامُ (Wa-'alaikumussalam): This is the response to أهلاً or مَرْحَباً. It means "and peace be upon you."

كَيْف الحآل؟ (Kaifa al-hal?): This means "how are you?" It is a polite way to ask someone how they are doing.

الحَمْد لله (Alhamdulillah): This is the response to كَيْف الحآل؟. It means "praise be to God" and is used to express that someone is doing well.

مَاذَا فِعْلُكَ؟ (Maza fi'luka?): This means "what are you doing?" It is a more informal way to ask someone what they are up to.

أَنَا بِخَيْرٍ، شُكْرًا (Ana bikhayr, shukran): This means "I am well, thank you." It is a polite way to respond to مَاذَا فِعْلُكَ؟.