It means you are going out and doing things. It could mean errands or socializing. We use it a number of different ways. Examples: I saw Mary while I was out and about. She's feeling much better and getting out and about.

It means to be running errands.

Out and about is an English idiom Example: Fully recovered after illness and back to daily activities I am just out and about with Kim if you want to come join us for lunch. It's nice to be out and about after being bedridden for so long.

It means going to different places. Example: She is always out and about, running errands and visiting friends.