This question is very dependent on what you need to use your computer for and which tablet you buy. The short answer is yes, most tablets can offer the most basic functions of a computer such as checking and replying to email, working on documents and spreadsheets, watching videos, and even light photo editing. Although, you might find it is easier to get tasks done on a computer as computer operating systems like Windows are designed for multitasking, and computers generally have a larger screen and more stable cursor and keyboard experience. There are some tablets like the Microsoft Surface Pro series that are tablets that run full Windows OS and offer powerful processors, this tablet would be the most suited to being a full laptop replacement.