What are the differences between hlsa and rgba ? Are they interrelated ? How ?

Answer 1

Both are different color models as HSL used the Hue/Saturation/Lighness triplet in percentage while RGB used Red/Green/Blue to indicate the color intensity in byte.
On the other hand the a in both models represent the alpha value which indicates the amount of transparency.
I believe you can find more detailed explanation on Google by using the keyword "Difference HSL RGB". 😉

Answer 2

HSLA stands for hue saturation and lightness and alpha. In RGB colors, we cannot change saturation and lightness of color, but in HSLA, we can change.