There are many reasons why you should use technology in the classroom. There are also disadvantages too.

My personal reason is that technology to use in the classroom should:

Support subject learning
Technology can be used as a tool for learning other than a media for fun and;
Enable you to develop student ICT capability and ICT literacy alongside subject learning.
In general, school technology should always be used by students as a tool for learning and a means to an end by teachers. It should never be used just because it is there. Additionally, simple exposure to technology in the classroom and the haphazard teaching of ICT skills will not sufficiently develop a child’s ICT capability either when it is integrated in the curriculum or as a subject itself.

Here are what I consider the pros and cons to technology in the classroom.

E-learning or Online Learning
The presence of ICT in education allows for new ways of learning for students and teachers.

ICT brings inclusion
Students with special needs are no longer at a disadvantage as they have access to essential material and special ICT tools can be used by students to make use of ICT for their own educational needs.

ICT promotes higher-order thinking skills
One of the key skills for the 21st century which includes evaluating, planning, monitoring, and reflecting to name a few.

ICT enhances subject learning
It is well known these days that the use of ICT in education adds a lot of value to key learning areas like literacy and numeracy.

ICT use develops ICT literacy and ICT Capability
Both are 21st-century skills that are best developed whilst ICT remains transparent in the background of subject learning.

ICT use encourages collaboration
ICT naturally brings children together where they can talk and discuss what they are doing for their work and this in turn, opens up avenues for communication thus leading to language development.

ICT use motivates learning
Society’s demands for new technology has not left out children and their needs. Children are fascinated with technology and it encourages and motivates them to learn in the classroom.

ICT in education improves engagement and knowledge retention
When ICT is integrated into lessons, students become more engaged in their work. This is because technology provides different opportunities to make it more fun and enjoyable in terms of teaching the same things in different ways

ICT use allows for effective Differentiation Instruction with technology
We all learn differently at different rates and styles and technology provide opportunities for this to occur.

ICT integration is a key part of the national curriculum
The integration of digital technologies or ICT is a significant part of the Australian Curriculum for example, and this is a trend that many global governments are taking up as they begin to see the significance of ICT in education.

Source Micheal Hilkemeijer