char is the amount of memory needed to store one ASCII character. On architectures that Source supports, this is one byte or eight bits.
char MyChar = 'T'; // single quote marks
Tip: Despite its name, there is no need for char to be used to store character data. It can also be employed simply as a means of storing one byte of data.
wchar_t are known as strings, and are used to store text.
char* means a pointer to a char, which is almost always the start of a string.