The features of hydrocarbons are as follows
1). Length of the carbon skeleton may differ ( C-C, C-C-C, C-C-C-C-C, etc.).
2). Branching of the carbon skeleton
3). The number of double bonds may differ ( C=C-C-C, C=C=C-C ).
4). The molecular structure may be in a ring form.
Its Simplest compound is Methane - CH4