@burcinc-- Complexion just means the appearance of your skin and includes factors like texture and color.
If your face is not shiny and oily or dry and taut, then you probably have a normal skin type. It's actually very straightforward. If your skin feels dry and taut, you need a dry skin cream. If it's oily, you need a cream formulated for oily skin. It's also possible to have a combination skin type where certain parts of your face are oilier or dryer. You can find combination creams as well.
It's important to use the right face cream suited for your complexion. Otherwise, you may develop problems like acne, wrinkles, hyper-pigmentation and so on. Pay more attention to your skin and how it feels throughout the day to determine your complexion. It might also help to try different complexion cream samples to see which one works best for you. Your skin should feel soft and supple after using the right complexion cream. Your pores should not be clogged and your skin tone should be the same everywhere.