In Scala, primitive types are defined as value types. Value types are types that represent values, and their instances are usually represented as a sequence of bits and bytes.
Scala has the following primitive types:
1. Byte: It is an 8-bit signed value. The range of values is from -128 to 127. For example, val b:Byte = 10
2. Short: It is a 16-bit signed value. The range of values is from -32768 to 32767. For example, val s:Short = 1000
3. Int: It is a 32-bit signed value. The range of values is from -2147483648 to 2147483647. For example, val i:Int = 2000000
4. Long: It is a 64-bit signed value. The range of values is from -9223372036854775808 to 9223372036854775807. For example, val l:Long = 20000000000L
5. Float: It is a 32-bit floating-point value. It offers 7 decimal digits of precision. For example, val f:Float = 12.345f
6. Double: It is a 64-bit floating-point value. It offers 16 decimal digits of precision. For example, val d:Double = 123.456
7. Char: It is a 16-bit unsigned Unicode character. For example, val c:Char = 'a'
8. Boolean: It is a Boolean value that can be either true or false. For example, val b:Boolean = true
In Scala, primitive types can be used in the same way as classes. They have constructors, methods and fields. For example, you can call methods on an integer value like this 1.toString(), and can use operators like + - * / % on integer values.