Hi there, I hope you are talking about the CTC offered during the placements.
The CTC stands for the cost to the company. It is actually the sum of all the perks and benefits like free meals, cab service, house, etc. that you get from the company along with the total salary package in a year. 
Whereas the salary given to you will depend on the company. Some companies give you salary monthly, weekly, or bi-weekly.
These are the most common ways to award salaries to the employees.
Thank You.