Attention refers to the ability to concentrate. The ability to focus selectively on a selected stimulus, sustaining that focus and shifting it at will.

Attention are cognitive res ources, mental effort, or concentration devoted to a cognitive process.

Moreover, Attention is defined as the process of seeking out and focusing on stimuli that are of interest in a way that causes these stimuli to become more deeply processed than those that are not receiving our attention
Other /More definition:
Attention refers to the active cognitive processing of a limited amount of information from the vast amount of information available through the senses, in memory and through cognitive processes; focus on a small subset of available stimuli.

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