Difference between Mail and E-mail

Parameter	E-Mail	Mail
Description	Electronic mail is a method of exchanging digital messages from an author to one or more recipients. Email operates across the Internet or other computer networks.	The mail or post is a system for physically transporting documents and other small packages, as well as a term for the postcards, letters, and parcels themselves.
Address	It uses Electronic address to send or receive messages.	Physical Address is used to send or receive messages.
Route	No Specific route is followed	Specific Route is Followed
Stamps	Uses Digital Stamps	Physical Stamps are used
Cost	Very Much Cheap	Costlier than Email.
Time	E-Mails are delivered in very short duration from seconds to minutes.	Delivery is slow and may be in days or months.

Computer Codes

1)   BCD (Binary Coded Decimal) Code:  This code is based on the idea of converting each digit of a decimal number into its binary equivalent in spite of converting the entire decimal value into a pure binary form. In this coding technique each decimal digit is independently converted to a  4 bit binary number which makes conversion process very easy.2⁴=16 configurations are possible but only first 10 are used to represent decimal digits from 0 to 9.

Character	BCD Code		Octal Equivalent
	Zone	Digit
A	11	0001	61
B	11	0010	62
C	11	0011	63
D	11	0100	64
E	11	0101	65
F	11	0110	66
G	11	0111	67
H	11	1000	70
I	11	1001	71
J	10	0001	41
K	10	0010	42
L	10	0011	43
M	10	0100	44
N	10	0101	45
O	10	0110	46
P	10	0111	47
Q	10	1000	50
R	10	1001	51
S	01	0010	22
T	01	0011	23
U	01	0100	24
V	01	0101	25
W	01	0110	26
X	01	0111	27
Y	01	1000	30
Z	01	1001	31
1	00	0001	01
2	00	0010	02
3	00	0011	03
4	00	0100	04
5	00	0101	05
6	00	0110	06
7	00	0111	07
8	00	1000	10
9	00	1001	11
0	00	1010	12

E.g. Conversion of decimal number 38 is done as follows

38₁₀= 0011           1000

             3                 8

Or 00111000 in BCD