MAC address is an unique address for an interface (1 MAC address for 1 Interface), such as your wi-fi Interfaces have their own MAC addresses for each or your LAN Interfaces have their own MAC addresses.

IP address tells you where you are and where your network located.

Port address identifies a process or service you want to do.

Let's make an example: Suppose Post offices are router.(don't care about the Session ID for simplicity) 

A sent "an invitation to the wedding"(Port address) to "B's house" in "CDE village"(IP address) via "Letter". 

Via letter means that the letter was gonna be sent to the "Letter box of B's house"(which has its own MAC address)

The Post office (That was nearer to A than B) looked at the IP address and checked where the nearest Post Office to B was and then forwarded the letter to the latter one. Then the latter post office looked up the sheet to find where B's MAC Address (B's letter box) and sent the letter to it. when B got the letter he would look at the Port Address(The invitation to what) and knew what the information in the letter was about.

PS.Suppose that B had assigned the Invitation to wedding session to Specific Port address. So he would know if it's an invitation to wedding from port number.

I'm trying to make this as much as simple for readers so it might not be 100 percent correct so feel free to make any comments I will be happy if you do.

Internet is network of networks. Mac address us machine address. Ip address is the unique address which every web page have and port address are the address of a particular application. So, when you are working on internet then you need all these three i.e, to access a web page, or a particular application, you need a machine I.e, either laptop, computer, phone etc. I hope this will work.

A MAC address is a Media Access Address, or machine address.  They are unique, there is only one of these addresses in the world.   These can be used at a hardware level to restrict connections or verify the right to connect.  A port address is at the application or program level and sets up a direct pipe to the target computer for special communications.  IP address is an assigned numeric address given to your computer by an Internet server.  these can be either static (Never changes) or dynamic (part of a shared pool of addresses that are first come, first served)

Why do you need your name, surname and address of home?

you name = MAC addressSurname = Port addressHome Address = IP address

Something like same applied to Computer Network to send bunch of packets from one station to another station.

Because MAC addresses are not internet addresses. They are a hardware level identifier tied to specific Ethernet interfaces in machines (in fact, your machine may have 2 MAC addresses if it has both a WiFi and a wired ethernet connection) 

There is no way to resolve a MAC address to a way to route the packet to that MAC address. Your MAC address is not normally viewable by the Internet at large (Besides, MAC addresses can be spoofed) 

That's what IP addresses are for -- IP addresses are a network level identifier -- the whole Internet is based on the ability of routers to forward packets to the 'next closer' router to the destination IP address. The Domain Name system facilitates informing the routers all around the Internet where the particular address is. 

An MAC address is a link-level address and useful only within the same network. 

An IP address is a routable address and useful across multiple networks (i.e. Internet). 

A port is a specific entiry within a host that is addressable by an IP address and may have multiple entities. 

A US host and UK host belong to different networks (i.e. link-level groups) and there are a different link-level networks between the two connecting them. IP routes independently from the lower (link, and other) layers.

In classful addressing, an IP address of class A,B and C is divided intotwo parts : netid and hostid.

The netid and hostid are of varying lengths, depending on the class of the address.

Netid: The part of an IP address that identifies the network.Hostid: The part of an IP address that identifies a host in a network.

Class A: One byte netid three bytes host idClass B: Two bytes netid Two bytes host idClass C: Three bytes netid One byte host id

Example:1.      IP address: 84.42.58.11

Binary Notation: 01010100 00101010 00111010 00001011It is a class A IP address.The network address /netid is 84.0.0.0The host addresses /hostid is 0.42.58.11

2.     IP address: 144.62.12.9It is a class B IP address.The network address /netid is 144.62.0.0The host addresses /hostid is 0.0.12.9