When we attend to something, we are giving it our attention. To attend means we are using one or more of our 5 senses.
If there is a plate of chicken rice in front of you, and you are hungry, you are likely to gobble down the food without paying much attention to what you eat.
If you are to be a judge for a food contest, and a similar dish is placed in front of you, what would you do? You will smell the food aroma, look at it closely for its colour and presentation, you will slowly taste it with your taste bud and feel its texture. You are engaging 4 out of your 5 senses (all except touch). You are attending to it.
When we attend to something, we are using our conscious awareness.