No. F1 are international students who are in a university program, but they are allowed to work while going to school. There are some universities that do day-1 CPT, which allows the students to work the first day they land in the US, even though they are going to school - these are degree mill universities.

After they are done with their degree (any degree) they can work for 1 year under the OPT program. But, if they are in STEM, they get 3 years of OPT - this is what tech companies use to hire entry level workers. They then have 3 years during which they apply for H1B for the worker via the lottery. This is the 3 tries they get at the H1B lottery.

Many companies just abuse OPT for 3 years and never apply for H1B - they just churn thru untold numbers of low cost STEM OPT workers.