Extraverted Sensation (or "Sensing") is one of the eight function-attitudes defined by Carl Jung.
Sensation (S) is an outlook that focuses on tangible, material or practical data and/or experience, which is generally “itemized” (i.e. attention to "details"), where existence is thought of in terms of what simply “is” or “isn’t”, or "the substance of" things.
An "extraverted" attitude (e) indicates that this outlook generally draws from the environment; or the outer world of "objects" that the "subject" (individual ego) observes.
So extraverted Sensing (Se) can be described as "an awareness of material reality in the environment", where one "turns outward" in attention to immediate at hand objects and experience, such as physical/practical items, as they occur. Every type does this, but for types who prefer Se, it will be their main form of information-gathering, rather than sensory "facts" they have stored in memory (Si), or intangible data such as inferences or hypothesis (N). These types will be denoted in the type code by an "S" and a "P"; i.e. "xSxP"; the "P" pointing to Sensing; as the "Perception" function, as being what is extraverted, or attuned to the environment.
The types holding the function as "dominant" are ESFP and ESTP, while for ISFP and ISTP, it is "auxiliary". (For NJ types, it is tertiary or inferior, and may also develop at some point in life).
An extraverted Sensation preference will be marked by particular atention paid to emergent or "at hand" sensory details, and as such, may come in handy for physical activities such as sports, or other activities such as arts and crafts.