trouble code, exemple SerialEvent

Using Arduino Project Guidance
#1

hi! i'm new and i'm noob...and my english is very bad, sorry.

i dont understand the exemple SerialEvent on the line 49, where is write :

char inChar = (char)Serial.read();

what does mean (char) in the parenthesis?

thank you for help me

#2

Serial.read returns an int.

The (char) shows that you really want to treat it as a char.

#3