1. no longer in contact or communicating with somebody
Professional
Social
I've been out of touch with him/her lately
The idea of being 'out of touch' emphasizes a disconnection from somebody or something. Therefore, this expression can be used when we want to say that we haven't been in contact with somebody for a long time. The term is sometimes hyphenated when used before a noun and can be used in both a social and professional context.
2. not informed or up to date with something
Professional
Social
your ideas are old-fashioned and out of touch
Another way to use 'out of touch' is to refer to somebody who is not knowledgeable about or up to date with current attitudes, trends, or a particular situation. You might say that your parents are out of touch with modern technology if they haven't kept up with advances in computers or smartphones.