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Viruses can only replicate inside other living cells.

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Viruses classified in groups depending on nucleic acid, shape, structure and method of replication.

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Old & Odd: Archaea, Bacteria & Protists - CrashCourse Biology #35

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Isocohedral Capsid
Helical Capsid

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Bacteriophage - this virus only attacks and replicates in bacteria.
Herpesvirus
Picornarvirus

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Bacteria come in three main shapes:

1) Spherical (like a ball)

These are usually the simplest ones. Bacteria shaped like this are called cocci (singular coccus).

2) Rod shaped

These are known as bacilli (singular bacillus).

Some of the rod-shaped bacteria are curved; these are known as vibrio.

3) Spiral

These known are as spirilla (singular spirillus).

If their coil is very tight they are known as spirochetes.

There are many variations within each shape group.

Most bacteria multiply by a process called binary fission. A single bacterial cell, the "parent," makes a copy of its DNA and grows large in size by doubling its cellular content.

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https://www.youtube.com/watch?v=s8jhJXgC-bk

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Microbiology - Viruses (Structure, Types and Bacteriophage Replication)

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Viruses contain capsids made up of cashmere proteins.
Genetic material is stored inside the capsid and the genetic material is made up of single/double stranded DNA and RNA. Partial strands can too exist, in viruses such as hepatitis b.
Some Viruses have envelope made up of lipid bilayer.
The envelope is useful because it fuses with the host cell and releases genetic material.
Virulence factors on the outer side of the virus targets certain types of cells.

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Often 100 nanometres. Can vary between 10 and 300 nm.

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Bacteria are prokaryotic cells; much simple than eukaryotic cells.