CSE:

Computer Science Engineering (CSE) encompasses a variety of topics that relates to computation, like analysis of algorithms, programming languages, program design, software, and computer hardware.

Computer Science engineering has roots in electrical engineering, mathematics, and linguistics. In the past Computer Science was taught as part of mathematics or engineering departments & in the recent days it has emerged as a separate engineering field.
Computer Science Engineers can find the opportunities in any of the following category

Design / Development / Testing/ Maintenance of software in IT industry

Networking & Security administrator in IT or any computerized industry.....
Software Developers :Software developers are professionals who are concerned with facets of the software development process which involves activities such as design and coding, computer programming, project management, etc.

Hardware Engineers :These professionals do research, design, develop, test, and oversee the installation of computer hardware which inter alia includes computer chips, circuit boards, systems, modems, keyboards, and printers.

System Designer :Professionals involved in system designing, Logical & Physical Designing wherein logical designing can be enumerated as the structure & characteristics such as output, input, files, database & procedures, etc.

IT:
Information Technology deals with the use of electronic computers and computer software to store, protect process, transmit and securely retrieve data. IT professionals perform a variety of tasks that range from installing applications to designing complex computer networks and information databases.

The major difference between both these field is that IT deals with the application of computing technology to real life processes, while, Computer Science deals with the science that facilitates these applications. To make it short and simple, Computer Science is the creation of software and hardware by using different programming skills. On the other hand, IT is just the selection of the proper software or hardware for the task.
Career options after b.tech in IT are good. IT Specialists are required in almost all range of employment fields such as finance, arts, medicine, defense, and other areas. Many opportunities are available in various IT firms all over India. Some of the leading IT Companies are Infosys, TCS, Wipro, Accenture, HCL Infotech, IBM, etc. These professional can get jobs in many public sector firms. Some of the leading public sector firms are BSNL, ISRO, CDIT, CDAC, etc.

ECE:

The main objective of the BTech (ECE) program is to equip students with necessary core competency to succeed long-term in engineering/ entrepreneurship careers after completing their B.Tech and are preparing to undertake PG studies and research as career options.

As a discipline, ECE focuses on the design of underlying hardware systems. Our curriculum is directed to applications in major areas such as telecommunications, energy and electronics sectors, while encouraging development of necessary skills for integration of hardware and software components. We believe that many creative opportunities exist at the boundaries of traditional CSE and ECE, and have accordingly planned for cross-training of students across disciplinary boundaries. The curriculum for ECE therefore has many courses in common with the CSE program initially. Thereafter, the program in year 3 & 4 is structured to allow customization by individual students based on their own personal preferences.

Electronics and Communication engineering is one of the most popular engineering branches out there. Among the Indian engineering aspirants, this particular discipline has been a popular choice for quite some time.

With the evolution of the computer age, electronics & communication has transformed into a field that is inevitable, required by almost all the industries.

Electronics is now part of our everyday life, from the mobile phones to televisions, computers and even the high-end advanced satellites that are helping us to lead a smooth life.

Even electronics and communication engineering is the major driving force for the present day Information Technology revolution.

Electronics and Communication Engineering has also penetrated into other areas like healthcare, instrumentation, automation, remote sensing, signal processing etc.

So students pursuing electronics and communication engineering have a lot of scope in varied industries.