Exterminate!
Daleks have little to no individual personalities, ostensibly no emotions outside hatred, and a strict command structure. They are conditioned to obey superior orders without question. Ultimately, the most fundamental feature of Dalek culture and psychology is an unquestioned belief in the superiority of the Dalek race. Other species are either to be exterminated immediately, or enslaved and then exterminated later once they are no longer necessary. The default directive of a Dalek is to destroy all non-Dalek lifeforms.
Another offshoot of this superiority complex is their complete ruthlessness and lack of compassion. It is because of this that it is nearly impossible to negotiate or reason with a Dalek and it is this single-mindedness that makes them so dangerous and not to be underestimated. However, their reliance on logic and machinery is also a weakness that they recognise. As a result, they also make use of non-Dalek species to compensate for these shortcomings
In their own words,...
All inferior people are to be considered the enemy of the Daleks and destroyed
Do not dispute with the daleks! obey without question!
A misconception exists that Daleks are wholly mechanical robots, this is false, the interior is depicted as being a soft and repulsive bio-engineered being, wholly without feelings and vicious in the extreme.
The only method of stopping a Dalek is with dalekanium, an unstable explosive that can penetrate Dalek casings. Or with the older models to run up stairs, however be advised that newer models can now 'elevate' by command.
source wikipedia