Why so spanish ppl use letter Y?

In Spanish, the letter "Y" (known as "igriega" or "griega") serves as both a consonant and a vowel. It is used as a conjunction meaning "and" (e.g., "Juan y María") and can also represent the vowel sound in certain contexts. Its usage is integral to the structure of the language, allowing for fluid connections between Words in sentences. Additionally, the letter has historical significance in the evolution of the Spanish alphabet.