Such an interesting question! I have found some information about Ancient Egyptian writin on the Internet, and based on it, I am sending you this answer:

The hieroglyphic writing was the earliest script form of Egyptian. This writing uses more than 2,000 hieroglyphic characters. Each hieroglyph represents a common object. Hieroglyphs could represent the sound of the object or they could represent an idea associated with the object. A modern type of hieroglyphic writings would be a rebus. Have you tried some rebus at school?

Hieroglyphics represent a person, an object, or an idea. They could be combined with different signs to spell out the words of the spoken language. However, the hieroglyphic indicates consonants only.

The decipherment of Egyptian hieroglyphs was made possible by discovery of the Rosetta stone, found in 1799 by Napoleonic troops fighting in Egypt. Although the stone was first the possession of a French officer, the victorious British demanded (and ultimately got) it, and it currently resides in the British Museum, in London.