What is the role of Sensor in Dslr camera

Does sensor matters for landscape photography 

The size of sensor that a camera has ultimately determines how much light it uses to create an image. In very simple terms, image sensors consist of millions of light-sensitive spots called photosites which are used to record information about what is seen through the lens.

The scene covered is wider in a full frame camera compared to a crop sensor camera for the same focal length. A medium format sensor or a large format sensor produces excellent images which not only cover more width and height but their colour reproduction, details captured etc. are far superior to what 35mm cameras do.

Larger sensor cameras are more expensive and heavier than smaller sensor cameras.

Larger format sensor images can be blown up to bigger size prints without loss of detail.