What is the need of both Physical address and Logical address in data communication?

1. physical adress also called mac adress and its totally used on layer 2. data link layer...and physical adress is used in layer 2 devices such as switches.....
2. and logical adress is also called ip adress (internet protocol) as name suggested that it is use on layer 3 and layer 3 is network layer.....

logical addresses(IP address) can be repeated in different networks which uses NAT. so that data will not get lost, logical addresses are tied to physical addresses as well as port numbers.

A physical address is the hardware-level address used by the Ethernet interface to communicate on the network. Every device must have a unique physical address. This is often referred to as its MAC (Media Access Control) address. An Ethernet physical address is six bytes long and consists of six hexadecimal numbers, usually separated by colon characters (:). For example 08:56:27:6f:2b:9c it uniquely identify the devicesover network.

IP address is  used to deliver the packets to an network by using network layer. it will be  change when we are moving to another network. 

IP address is  used to deliver the packets to an network by using network layer. it will be  change when we are moving to another network. 

MAC address is used toEnd -to- End delivery of packet at destination machine . by using Data link layer .it is unquie address.

IP address : is just deliver the packets to particular network (used by Network layer)

Destination Mac address: are used to End-To-End delivery of packet at destination machine.(Data link layer)

In data communication Physical Address (MAC address) is used by the Frame, and it will be changed in each local network as the sending and receiving host changes in each segment of the network through out the data communication.

Logical Address (IP address) is used by the Packet and will remain same through out the communication.

I am not sure if  this a right question as this is part of the basic knowledge if you ever want to embark on computer networking journey in your career.

MAC address should be unique and fixed to the physical device, while IP address can be changed when when the device moves from one network to another.

MAC address works in the data link layer, and IP address works in the network layer.

MAC address is usually being used for communication between hardware, and IP address usually is being used in the commucation between the software stored inside the hardware.

MAC address alone will not be reachable by any software, as software/application is involved, the device must have an IP address.

On a high level, IP address allows you to look for the particular device which is having that IP address right now while you are trying to reach it using a piece of software. On a lower level, the hardware devices, i.e. routers, switches, firewall, etc will recognize each node and interface MAC address and transmit/received packets to the next interface.