Portuguese phonology is all about the way that people in Portugal and other Portuguese-speaking countries make sounds when they talk. Just like when you say "mama" or "dada" when you're little, every language has its own special sounds that make it different from others.
Portuguese has a lot of different sounds that we use when we talk. For example, "ao" sounds like a combination of "ow" and "oh". Meanwhile, "ãe" sounds like "an-yeah". Another interesting feature of Portuguese phonology is the nasal sounds like "ã" and "õ". Nasal sounds come from the nose instead of the mouth, and add a unique flavor to the language.
Many of the sounds in Portuguese are also different from those in English. For example, in Portuguese the letter "d" sounds more like a "j" in "jump" or "jar". And the letter "r" is pronounced differently too - it's more like a sound made at the back of the throat instead of using the tip of the tongue like in English.
All these different sounds might seem a little tricky at first, but with practice, you'll get the hang of it!