Essays / The main aspects of your mobility proposal. Lotus+ Erasmus Mundus Scholarship Application Form [7]

I am applying for Computer Science Master Degree Full program through Lotus+ action 2 by Erasmus Mundus. There is one section of the application that I don't understand. The instruction goes like this:

Please indicate the main aspects of your mobility proposal.
The mobility programme proposed must coherently describe the existing relation between the activities you develop and those you intend to develop at the host institution. Describe in detail the mobility programme you intend to develop at the host institution.

And applicants must write an essay of at most 2500 words for it. If anyone understands, please help explain it. Thanks in advance.