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Both disciplines seek to understand similar things (how interesting biological phenomena work), but use slightly different methods. Molecular biologists are interested in things like the level of gene expression (how much protein or RNA is present at any given time), which molecules are directly touching each other inside the cell, etc. Most molecular biology techniques require breaking cells open.

Cell biology techniques, on the other hand, want to know what's going on inside intact cells. Things like immunofluorescence (using fluorescently conjugated antibodies to find proteins within the cell), in situ hybridization (finding specific RNA or DNA within the cell), or even simple, direct observations of behavior or morphology are common approaches in cell biology.

Of course, there's a ton of overlap between the two (look at the name of my academic department, for starters), and most experimental biologists are likely using techniques from both disciplines.
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Explanation:

Cell biology (also cellular biology or cytology) is a branch of biology studying the structure and function of the cell, also known as the basic unit of life. Cell biology encompasses both prokaryotic and eukaryotic cells and can be divided into many sub-topics which may include the study of cell metabolism, cell communication, cell cycle, biochemistry, and cell composition.

Genetics, study of heredity in general and of genes in particular. Genetics forms one of the central pillars of biology and overlaps with many other areas, such as agriculture, medicine, and biotechnology. Learn more about the history, biology, areas of study, and methods of genetics.

Molecular biology, field of science concerned with studying the chemical structures and processes of biological phenomena involving molecules. In particular, researchers focus on DNA, RNA, and proteins and their interactions. As a result, the field is closely related to genetics and biochemistry

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