Split Function in Sql Server to break Comma-Separated Strings into Table

Sql Server does not (on my knowledge) have in-build Split function.
Split function in general on all platforms would have comma-separated string value to be split into individual strings.
In sql server, the main objective or necessary of the Split function is to convert a comma-separated string value (‘abc,cde,fgh’) into a temp table with each string as rows.
The below Split function is Table-valued function which would help us splitting comma-separated (or any other delimiter value) string to individual string.

1. CREATE FUNCTION dbo.Split(@String varchar(8000), @Delimiter char(1))       
2. returns @temptable TABLE (items varchar(8000))       
3. as       
4. begin       
5.     declare @idx int       
6.     declare @slice varchar(8000)       
7.       
8.     select @idx = 1       
9.         if len(@String)<1 or @String is null  return       
10.       
11.     while @idx!= 0       
12.     begin       
13.         set @idx = charindex(@Delimiter,@String)       
14.         if @idx!=0       
15.             set @slice = left(@String,@idx - 1)       
16.         else       
17.             set @slice = @String       
18.           
19.         if(len(@slice)>0)  
20.             insert into @temptable(Items) values(@slice)       
21.   
22.         set @String = right(@String,len(@String) - @idx)       
23.         if len(@String) = 0 break       
24.     end   
25. return       
26. end  

split function can be Used as

1. select top 10 * from dbo.split('hello,world,!',',')  

would return
hello
world
!

Above Split function can be used to pass parameter to IN clause in sql server.