The reason is cat6 cables come up with a better insulation to reduce crosstalk and other consequences that come up as a source of on the line noise in cable based networks.
Cable rj45 cat 5e ou 6.
If you have to use a cat cable with an rj45 connector in order to create a domestic network at your home cat5 type wires are quite enough.
In the picture above the cat 5e cable is the only one with a spline.
Cat 6 and cat 5e should work with either type.
Cat6 connectors are designed for 24 and 23 awg conductor wire.
Although the spline is not required in cat 5 cable some manufactures include it anyway.
Cat6 cables also called category 6 or cat 6 cables provide lower crosstalk a higher signal to noise ratio and are suitable for 10gbase t 10 gigabit ethernet while cat5e cables support only up to 1000base t gigabit ethernet.
Cat 6 has to meet more stringent specifications for crosstalk and system noise than cat 5 and cat 5e.
If you have used your current crimper plug combo to make working cables in the past it should still work with cat 5 cat 5e and cat 6.
As the description implies a solid cable uses a single piece of copper for the electrical conductor within each wire of the cable whilst stranded wire uses a series of copper strands.
Cat 5 is also used to carry other signals such as telephony and video.
Many cat 6 cables also include a nylon spline which helps eliminate crosstalk.
In cat 6 cable the spline is not required either as long as the cable tests according to the standard.
A further difference within the ethernet cables whether cat 5 cat 5e cat 6 cat 6e or cat 7 can be whether solid or stranded wires are used within the cable.
Category 6 cable cat 6 is a standardized twisted pair cable for ethernet and other network physical layers that is backward compatible with the category 5 5e and category 3 cable standards.
The only thing you have to look out for is the crimper plug combination.
Cat5e and cat6 cables are both backwards.
The cable standard specifies performance of up to 250 mhz compared to 100 mhz for cat 5 and cat 5e.
For example cat6 ez rj45 connectors from platinum tools use 0 275 inches as a maximum cable od which is plenty for a typical 0 205 diameter cat5e cable.