Dear Student ,

CSE means Computer Science and engineering i.e. you have to study about programming and data structure and gain the knowledge to build any software or in app development , basically CSE syllabus is structured  in a way that you can instruct a computer's brain how to implement any work which will help to connect the user with the computer in a friendly behavior. Now a days , artificial intelligence and machine learning are a vital part of the 4year CSE syllabus .

ECE means  Electronics and communication engineering , working with the hardware of computer instead of software , besides that in ECE syllabus , you will get knowledge about signals and communication systems for both analog and digital purposes , in one sentence .. ECE course will help you to be capable of working with medium and source as well as you will gain a deep knowledge about electronic devices .

to know in brief details about the syllabuses , refer to these links:

https://www.careers360.com/courses/b-tech-in-computer-science

https://www.careers360.com/courses/b-tech-in-electronics-and-communication-engineering

Hope you understand !