chop is used remove last character,chomp function removes
only line endings.

Chop and Chomp are two very similar functions. Both of them 
are used to delete symbols from the tail of the given 
string. While both work with string and list parameters, 
Chop deletes any ending symbol Chomp deletes only specified 
substring from the end. If you pass list to any of these 
two, all list elements will get processed and the return 
value would be the result of last operation.

chop() removes the last character from a scalar value.

chomp() checks whether the last characters of a string or 
list of strings match the input line separator defined by 
the $/ system variable. If they do, chomp removes them.

chop will indiscriminately remove (and return) the last 
character passed to it, while chomp will only remove the 
end of record marker (generally, "\n"), and return the 
number of characters so removed.