Thank you both for your replies. But I am still a little confused.
Under the offer of employment there is an instruction as follows:
"You must provide a job offer letter from the employer who wants to hire you. It must be printed on company letterhead, and state that you will be employed permanently in Canada by that company. The letter must specify whether the job is:
for continuous, paid, full-time work (at least 30 hours a week),
for work that is permanent and not seasonal,
skill type 0, or skill levels A or B of the 2011 National Occupational Classification (NOC)
(Note – in most cases, the job offer must be for a permanent job. For some types of jobs, it has to be for at least one year.)
The job offer letter must include contact information for the company (address, telephone number and email address)."
However, under the letter of employment there is no any instruction.
In addition to these two, there is another request for employment records of my current job as follows:
"You must provide proof of work experience for your current job and for each past position you listed. Proof must include a reference letter from your employer and pay stubs, if you have them. The reference letter must:
• be an official document printed on company letterhead
• include your name, the company’s contact information (address, telephone number and e-mail address), the signature of your immediate
• show all positions held while employed at the company
• include these details: job title, duties/responsibilities, job status (if current job), the dates you worked for the company, the number of work hours per week and your annual salary plus benefits.
You must scan all documents for this period of employment and save them as one file. (You must create a separate file for each period of employment.)"
Therefore, in total there are three requests for my current job. I am thinking that the employment records is the reference letter from my employer (the one with job duties); the offer of employment is the offer letter sent to me before I started my job. But how about the letter of employment? Do I use the offer letter or the reference letter? I don't think it makes sense for me to get an additional letter from my employer. I am so confused.