"Either" can be used in several situations to mean "one or the other, but not both" of two things. A few examples: "I must choose either the green or the red curtains." (i.e. The person can choose the green curtains OR the red curtains , but not both.) "You can take either road." (i.e. There are two roads and the person can take one or the other.)
To add to what has already been posted. Either can also be used to when indicating that someone/something doesn't meet a condition along with someone/something else. For example.
John: I don't have a dog. You: I don't have a dog either. lit. (I also don't have a dog.)
Another example.
Jim isn't going to the party this weekend. Gary isn't going eith
0Wow ! ur such a great explainer (to Toronto ) I also thank to u . I didn't know ' either , neither ' words nicely before . Even I saved ur post in my pc . 02br 02br 00Thanks again 0-