This is a classical nonogram or Japanese puzzle with standard rules. If you solve this puzzle you will see a picture of a little animal.
To solve it use numbers on the left and on the upper side of the grid as indices. These numbers show how many colored cells are in each block. For example, if you see the numbers 5,2 on the left of the row, then in this row there 5 colored cells in block, then some cells are blank, then 2 colored cells. Left clck the square to change its color. Left click again to make the cell blank.